meghanejacobs

1.   525 + 372 =

How many moles and grams of carbon are present in 2.17 g of aspirin, ?

moles of C ______ mol

grams of C ______ 9

Help me I don’t understand

How many moles of are present in a 69.9g sample? 

    ______ mol

How many moles of are present in a 69.9-g sample?

_________ mol

What is 2+2+2*2?

A Norman window has the shape of a semicircle atop a rectangle so that the diameter of the semicircle is equal to the width of the rectangle. What is the area of the largest possibe Norman window with a perimeter of 43 feet?

Nathan has 4 brown teddy bears. 5 pink teddy bears and 3 red teddy bears in his shop. Two teddy bears are drawn without replacement from the shop. What is the probability that both of the teddy bears are brown?

find the vertex

First photo is the main question, the example is shown in the other photo.

Solve the system of equations.

 

 

 

To eliminate the x-item from the second equation. Multiply both sides of the first equation by - 1 and add the result to the second equation.

 

     

Now use the sarse method so eirrinale the x-term in the third equation

Multiply both sides of the first equation by -1 and add the result in the third equation.

 

 

 

The equivalent system with the new second and third equations is shown below. The next step is to eliminate the y-term from the third equation.

 

     

 

To eliminate the y-item from the third equation. Multiply both sides of the second equation by 11 and add the result to the third equation.

 

 

 

Finally, to obtain an x-coefficient of 1 in the this equation multiply both sides of the third equation by  

 

 

The system is now in echelon form. Solve by back-substitute.

 

 

 

The third equation gives the value of a

Back-substitute 2 tor z in the second equation and solve for y: