taupesnail656

For flutter 3.3.2 fixed the return statement now having issues with the following lines - lib/main.dart(16,18): error G4127D1E8: The getter '_formkey' isn't defined for the class 'MyAppState'. [D:\form_widget5\build\windows\flutter\flutter_assemble.vcxproj]
lib/main.dart(28,23): error G4127D1E8: The getter 'loginData' isn't defined for the class 'MyAppState'. [D:\form_widget5\build\windows\flutter\flutter_assemble.vcxproj]
lib/main.dart(46,23): error G4127D1E8: The getter 'loginData' isn't defined for the class 'MyAppState'. [D:\form_widget5\build\windows\flutter\flutter_assemble.vcxproj]
lib/main.dart(56,27): error G4127D1E8: The getter '_formkey' isn't defined for the class 'MyAppState'. [D:\form_widget5\build\windows\flutter\flutter_assemble.vcxproj]
lib/main.dart(57,25): error G4127D1E8: The getter '_formkey' isn't defined for the class 'MyAppState'. [D:\form_widget5\build\windows\flutter\flutter_assemble.vcxproj]
lib/main.dart(59,52): error G4127D1E8: The getter 'loginData' isn't defined for the class 'MyAppState'. [D:\form_widget5\build\windows\flutter\flutter_assemble.vcxproj]
lib/main.dart(62,52): error G4127D1E8: The getter 'loginData' isn't defined for the class 'MyAppState'. [D:\form_widget5\build\windows\flutter\flutter_assemble.vcxproj]

Full code listed below

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

void main() {
runApp(const MyApp());
}

class MyAppState extends State<MyApp>{
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body : Container(
padding : const EdgeInsets.all(50.0),
child : Form(
key: _formkey,
child: Column(
children: [
TextFormField(
keyboardType: TextInputType.emailAddress,
validator: (String? inValue) {
if (inValue?.isEmpty?? true) {
return "Please enter username";
}
return null;
},
onSaved: (String? inValue) {
loginData.username = inValue!;
},
decoration: const InputDecoration(
hintText: "[email protected]",
labelText: "Username (eMail address)"
),
),
TextFormField(
obscureText: true,
validator: (String? inValue) {
if (inValue == null) {
return "Password cannot be null";
} else if (inValue.length < 10) {
return "Password must be >= 10 in length";
}
return null;
},
onSaved: (String? inValue) {
loginData.password = inValue!;
},
decoration: const InputDecoration(
hintText : "Password",
labelText : "Password"
),
),
ElevatedButton(
child : const Text("Log In!"),
onPressed: (){
if (_formkey.currentState!.validate()){
_formkey.currentState!.save();
if (kDebugMode) {
debugPrint ("Username: ${loginData.username}");
}
if (kDebugMode) {
debugPrint ("Password: ${loginData.password}");
}
}
},
),
]
),
),
),
),
);
}
}

class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
MyAppState createState() => MyAppState();
}

class LoginData {
String username = "";
String password = "";
}

If y = (1 + x) (1 + x2) (1 + x4), then dy/dx at x = 1 is

1) 20

2) 28

3) 1

4) 0  

What is computer?

Oxycodone (C18H21NO4),a narcotic analgesic, is a weak base withpKb=5.47.

Calculate thepH in a0.00250Moxycodone solution.

Which I got the answer ofpH =9.96

How do I do the rest ofthese?

b.Calculate the concentrations of C18H21NO4in a 0.00250Moxycodone solution?

c. Calculate the concentrations of

HC18H21NO+4in a 0.00250M oxycodone solution.

d. Calculate the concentrations of

H3O+in a 0.00250M oxycodone solution.

e. Calculate the concentrations of

OH?in a 0.00250M oxycodone solution

What causes the disease/disorder/syndrome/condition that Oxycodone is used to treat?

Please explain to me the peripheral nervous system and the two types of it. 

1. On Jan. 2, Callie Company received a $700 payment from a customer previously billed for services performed. The journal entry to record this transaction would include a (debit, credit) to the account and a (debit, credit) to the Accounts Receivable account.

Why would some medical offices not implement electronic health records? Discuss three (3) pros and three (3) cons to EMR with two examples you may see in your current role or future role in medical billing.

A foods class surveyed 1100 students about which meals they ate in their dormitory cafeteria. The class found the following information:

425 ate breakfast.

680 ate lunch.

855 ate dinner.

275 ate breakfast and lunch.

505 ate lunch and dinner.

375 ate breakfast and dinner.

240 ate all three meals.

(a) How many ate only breakfast in the cafeteria?

(b) How many ate at least two meals?

(c) How many ate only one meal?

(d) How many ate exactly two meals?

(e) How many did not eat in the cafeteria?

Cite 5 ways what NORSU can do to prevent drug abuse. Explain each. Use 200 words.

What is the role of NORSU to minimize Anti Graft and Corrupt Practices. Use only 200 words.

Let G be a finite group.

Checkpoint 4

• Exercise PART A. Please match each subject with the most logical form.

1 Mi madre: 2. Mis amigos:

tengo                              tengo

tienes                             tienes

tiene                              tiene

tenemos                            tenemos

tienen                             tienen

3 Yo: 4. Nuestros amigos:

tengo                              tengo

tienes                             tienes

tiene                              tiene

tenemos                            tenemos

tienen                             tienen

5 Nuestra clase: 6. Mi novia:

tengo                              tengo

tienes                             tienes

tiene                              tiene

tenemos                            tenemos

tienen                             tienen

7 Tú: 8. Tu sobrina:

tengo                              tengo

tienes                             tienes

tiene                              tiene

tenemos                            tenemos

tienen                             tienen

9 Ud.: 10. Uds.:

tengo                              tengo

tienes                             tienes

tiene                              tiene

tenemos                            tenemos

tienen                             tienen

What are the core values of chemical household cleaning company that specializes in the production of household cleaning chemicals such as dishwashing detergents, bleaching liquid, liquid laundry detergent, floor detergents, shampoo, body wash, and hairstyle gel. Please provide references.

Learning Goal: To understand length contraction and timedilation.

An inertial frame of reference is one in which Newton's laws hold.Any frame of reference that moves at a constant speed relative toan inertial frame of reference is also an inertial frame. Theproper length l_0 of an object is defined to be the length of theobject as measured in the object's rest frame. If the length of theobject is measured in any other inertial frame, moving with speed urelative to the object's rest frame (in a direction parallel tol_0), the resulting length l is given by the length contractionequation

l = l_0\sqrt{1-\frac{u^2}{c^2}} ,

where c is the speed of light. Similarly, if two events occur atthe same spatial point in a particular reference frame, and anobserver at rest in this frame measures the time interval betweenthese two events, the time interval so measured is defined to bethe proper time Delta t_0. When the time interval is measured inany other inertial frame, again moving with speed u relative to thefirst frame, the resulting time interval Delta t is given by thetime dilation equation

\Delta t = \frac{\Delta t_0}{\sqrt{1-\frac{u^2}{c^2}}} .

a. Suppose that you measure the length of a spaceship, at restrelative to you, to be 400 \rm m. How long will you measure it tobe if it flies past you at a speed of u = 0.75c?
Express the length l in meters to three significant figures.

b. The spaceship from Part A has a large clock attached to itsside. This clock ran at the same rate as your watch when you werein the same reference frame. How much time Delta t will pass onyour watch as 80 \rm s passes on the clock attached to theship?
Express your answer in seconds to three significant figures.

c. Two spaceships, named A and B, are flying toward each other withrelative speed 0.800c. If the captain of ship A fires a missile,counts 10.0 \rm s on his watch, and then fires a second missile,how much time Delta t will the captain of ship B measure to havepassed between the firing of the two missiles?
Express your answer in seconds to three significant figures.

d. The captain of ship B knows that ship A uses 2-m-long missiles.She measures the length of the first missile, once it has finishedaccelerating, and finds it to be only 0.872 \rm m long. What is thespeed u of the missile, relative to ship B?
Express your answer in meters per second to three significantfigures. Use c = 3 \times 10^8 \; \rm m/s.

Please answer fully... thank you

Write 11 pages with APA style on Effect of Social Networks on Communication Management. Fifteen to twenty five journal articles by different scholars of the world were reviewed by the researcher. The results revealed that social media has an effect on both organizational and public communication management. Social media therefore has an influence on both the company and public communication.

Over the last two decades, social media has become the most used form of communication in the world. Different scholars and researchers of the world attribute this fact to the vast growth and development of technology of the world that has not only expanded public communication but also expanded the organizational communication. internal and external by providing an adequate platform through which communication takes place (Leornardi et.al, 2013). Social media has a direct impact on the organizational strategies. For instance, use of social media directly impacts on the marketing strategies as well as the advertising strategies of the different companies of the world. Different scholars of the world argue that even though social media platform has been criticized for erosion of privacy in the different organizations, it has brought the customers closer to the products and further enhanced productivity of the different companies of the world through enhanced employee-employee communication (Iyengar et.al, 2012).

The discussion surrounding the effects of social media is among the most recent in the field of communication. Having emerged not long ago, social media has revolutionized the communication means (Keyton, 2011). It has further taken part in transformation of the world into a global village. The speed at which information travels from one location to another in this present day has been improved by far. Following the increased interaction between people, organizations and even people and organization, commercial activities such as trade have further grown and expanded (Leornadi et.al, 2014)

In 1897 J.J. Thomson discovered the electron. While he could notfind all the separate properties of the electron, he veryaccurately found the charge to mass ratio, Q/m, using a fairlysimple set up, and the same physics we have learned in class.Thomson knew electric and magnetic fields could deflect chargedparticles, and used these concepts to prove that cathode rays wereactually negatively charged particles which were later namedelectrons. There are several set ups which can mimic Thomson’sdiscovery, and you will be working out the details of two of them.Note that you will not be solving for a number for the charge tomass ratio, but rather a formula that could be experimentallytested. Your equations will have a few parameters anexperimentalist could tweak to get results. With the charge to massratio known, 1.758820150*1011 C/kg, find some values for yourparameters that would produce the correct results.

The first experiment involves a vacuum tube with a cathode andanode at one end, and a phosphor plate at the other (the theelectrons strike the phosphor it glows, signifying where theelectron hit). The cathode/anode pair provides an initial voltagessource to accelerate the electrons. The electrons then pass througha small slit in order to focus them into a thin beam. This beanthen passes through two parallel plates (creating an electricfield), and past the midpoint of two Helmholtz coils (two largecurrent carrying coils of radius R, separated by a distance R). Ifthe voltage across the plates and the current across the Helmholtzcoil are tuned just right, there should be no deflection of theelectron beam, and the phosphor plate should simple glow at itscenter. Using the concepts and equations discussed in class, findan expression for the charge to mass ratio, Q/m.

The second experiment is similar to the mass spectrometer wediscussed in class. An electron beam is first accelerated by avoltage source, and then passes into a region of uniform magneticfield. The experiment is performed in a vacuum tube which is filledwith a small amount of phosphor gas so the arc of the electron beancan be seen and measured. Find a new expression for the charge tomass ratio, which this time will also include the radius of the arcthe electron beam would make.
Hint: Your final expressions should not contain the velocity of thebeam, as it cannot be directly measured. Think about work andenergy to find a way to remove velocity from the equations.
Now pretend you are giving your equations to an experimentalist.Provide some voltages, currents, magnetic fields, etc. for each ofyour equations to give no deflection, and hence the proper chargeto mass ratio.

Please show all of your work. After you have derived yourexpressions, briefly explain in a paragraph or two what conceptsyou used and why you chose the formulas used. After J.J. Thompsonfound the charge to mass ratio, he concluded the electron must havean extremely small mass. Based on the charge to mass ratio given(pretend for this part you do not know the charge and mass of anelectron separately), try to give some reasons why Thompson madehis assumptions.

As measured by an observer on Earth, a spacecraft runaway on Earthhas a length of 1200m. What is the length of the runway as measuredby the pilot of a spacecraft flying past at a speed of 8.00*10^7m/s relative to the Earth?

An observer on Earth measures the time interval from when thespacecraft is directly over one end of the runway until it isdirectly over the other end. What result does she get?

The pilot of the spacecraft measures the time it takes him totravel from one end of the runway to the other end. What value doeshe get?

You are an observer in a 100-m long spacecraft traveling from the earth to the moon at 0.8c.

(a) What is the proper length of the spacecraft?

(b) For a proper time interval of 1 sec., the relativistic time interval for the spacecraft measured from the earth reference frame would be

(c) Time dilation does not apply to all time-dependent physical and biological processes. T/F?

(d) What is the relativistic length, DL measured from the reference frame of earth?

(e) An APOLLO crew left a flat mirror reflector on the surface of the moon. If the average surface-tosurface distance from the earth to the moon is   then how long does it take moonlight to reach earth? 

What is the magnitude of the gravitational attraction between Saturn and Earth expressed in Newtons. Assume that Earth and Saturn are aligned so that a straight line can be drawn from the Sun through Earth and then to Saturn.

as earth slowly cooled

The force of gravity varies with the__

Using Flutter 3.3.8 by the way it requires me to use const to those who say I need to remove them. Anyway after taking people's suggestions created a widget for the return line.

But now asking for class for the _formkey. What do I type in for the class for the _formkey?

class MyAppState extends State<MyApp>{
@override
Widget build(BuildContext context) {
return Form(
key: _formkey,
child: Column(
children: const [
// Input fields and submit button go here
],
),
);
}
See screenshot and the full code below.   import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

void main() {

runApp( const MyApp());
}
class MyAppState extends State<MyApp>{
@override
Widget build(BuildContext context) {
return Form(
key: _formkey,
child: Column(
children: const [
// Input fields and submit button go here
],
),
);
}
}



class MyApp extends StatefulWidget {

const MyApp({super.key});

@override

MyAppState createState() => MyAppState();
}

class LoginData {
String username = "";
String password = "";
}

class _MyApp extends State {

LoginData loginData = LoginData();
final GlobalKey<FormState> _formkey = GlobalKey<FormState>();
@override

Widget build(BuildContext inContext) {
return MaterialApp(home: Scaffold(
body : Container(
padding : const EdgeInsets.all(50.0),
child : Form(
key: _formkey,
child: Column(
children: [
TextFormField(
keyboardType: TextInputType.emailAddress,
validator: (String? inValue) {
if (inValue?.isEmpty?? true) {
return "Please enter username";
}
return null;
},
onSaved: (String? inValue) {
loginData.username = inValue!;
},

decoration: const InputDecoration(
hintText: "[email protected]",
labelText: "Username (eMail address)"
),
),

TextFormField(

obscureText: true,

validator: (String? inValue) {
if (inValue == null) {
return "Password cannot be null";
} else if (inValue.length < 10) {
return "Password must be >= 10 in length";
}
return null;
},

onSaved: (String? inValue) {
loginData.password = inValue!;
},

decoration: const InputDecoration(
hintText : "Password",
labelText : "Password"
),
),

ElevatedButton(

child : const Text("Log In!"),

onPressed: (){

if (_formkey.currentState!.validate()){

_formkey.currentState!.save();

if (kDebugMode) {
debugPrint ("Username: ${loginData.username}");
}
if (kDebugMode) {
debugPrint ("Password: ${loginData.password}");
}

}

},

),

]

),

),

),

));

}

}

Consider the following unbalanced equation Al + O₂ -> Al₂O₃

1) Balance the equation

2) Determine the molar mass

3) Identify the reaction

4) How many moles of ocygen must react with 4.50 mols of Al?

5) How many grams of aluminum oxide are produced when 50.2 grams of aluminum react?

6) When 0.500 mols of aluminum reacts in a closed container with 8.0 grams of oxygen, how many grams of aluminum oxide is formed?

7) From the results in #5 what is the limiting reactant?

8) What is the theoretical yield?

9) Your actual yield is 15.75 grams

10) What is your percent yield?

1. Balance equation _Ag2+ ______Al —->Ag+ ___Al2S3

     1a) Explain how the above chemical reaction relates to the activity series of metals

2. If 1.356mol of Ag2S reacts with 0.772mol of Al, determine the theoretical yield of aluminum sullied using the steps :

- determine the limiting reactant

- determine made of aluminum sulfide

Torque can be calculated by multiplying the force (N) applied at  90∘90∘ to the lever arm at a distance (mm) from the pivot point (point of rotation), the compound SI unit for the torque is N⋅mN⋅m. If the force (at 90∘90∘ to the lever arm) applied is 15 N15 N and it is applied at 2.0 m2.0 m from the pivot point (point of rotation), what is the torque on the lever?

1. What is the (a) weight % and (b) mol% and atom % concentration of Cr in the mineral chromite (FeCr₂O₄)?

A 6.22 kg mixed-mineral sample contains chromite (FeCr2O4) as the only chromium-bearing ore. The sample is subjected to an industrial process, using a ferrosilicon alloy as a reducing agent, which quantitatively converts all of the chromium into 11.9 kg of a ferrochrome alloy (stainless steel) which is 18.9% Cr by mass.

What is the percentage of chromite (FeCr2O4) in the original sample?

Combustion analysis of a 12.01-g sample of an unknown compoundwhich contains only carbon, hydrogen, and oxygen-produced 14.08g CO2and 4.32 g H2O.Find the empirical formula for the unkown compound

1) The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. A hydrocarbon exhibits no bands above 3000 but gives weak absorption at 2200 cm^-1.
Relative absorption intensity: (s)=strong, (m)=medium, (w)=weak.

What functional class(es) does the compound belong to?
List only classes for which evidence is given here. Attach no significance to evidence not cited explicitly.
Do not over-interpret exact absorption band positions. None of your inferences should depend on small differences like 10 to 20 cm^-1.

The functional class(es) of this compound is(are).(Enter letters from the table below, in any order, with no spaces or commas.)