saicharanreddy0000

1
Marks: --/10
Which of the following is a quadratic function?
Choose one answer.
a. f(x) = 2x - 9x2 + 7
b. f(x) = 5x + 7
c. f(x) = -2 - 8x
d. f(x) = 1 + 5x3 - 4x2 - 4x
Question 2
Marks: --/10
Show that the following function is a quadratic function by writingit in the form f(x) = ax2 + bx + c and identifying a, b, andc.

f(x) = (x + 6)(x + 5)

Choose one answer.
a. f(x) = x2 + 30; a = 1, b = 0, c = 30
b. f(x) = x2 + 30x + 30; a = 1, b = 30, c = 30
c. f(x) = x2 + 11x + 30; a = 1, b = 11, c = 30
d. f(x) = x2 + 30x + 11; a = 1, b = 30, c = 11
5
Marks: --/10
Which of the following is a quadratic function?
Choose one answer.
a. f(x) = -6 + 7x
b. f(x) = -3x + 3
c. f(x) = -4x3 - 6x2 - 4x - 3
d. f(x) = 9 + 8x2
Question 6
Marks: --/10
Show that the following function is a quadratic function by writingit in the form f(x) = ax2 + bx + c and identifying a, b, andc.

f(x) = (5x + 1)(3x - 1)

Choose one answer.
a. f(x) = 15x2 - 2x - 1; a = 15, b = -2, c = -1
b. f(x) = 15x2 - 8x - 1; a = 15, b = -8, c = -1
c. f(x) = 15x2 - 2x + 1; a = 15, b = -2, c = 1
d. f(x) = 15x2 + 2x - 1; a = 15, b = 2, c = -1
Question 7
Marks: --/10
Show that f(x) - 3 = 5x(-5x + 7) - 6x2 + 4 is a quadratic functionby writing it in the form f(x) = ax2 + bx + c and identifying a, b,and c.

Choose one answer.
a. f(x) = -31x2 + 35x + 7; a = -31, b = 35, c = 7
b. f(x) = -19x2 + 41x + 7; a = -19, b = 41, c = 7
c. f(x) = -31x2 + 30x + 7; a = -31, b = 30, c = 7
d. f(x) = -19x2 + 35x + 1; a = -19, b = 35, c = 1
Question 8
Marks: --/10
Graph the following function and give the approximate coordinatesof the vertex.

f(x) = 8 - 3x - x2

Choose one answer.
a. (-1.5, 10)
b. (10, - 1.5)
c. (1.5, -10)
d. (-1.5, -10)
Question 9
Marks: --/10
State whether the opens up or down and whether the y-coordinate ofthe vertex is the minimum or maximum value of the function.

f(x) = x2 - 6x + 4

Choose one answer.
a. opens up; maximum value
b. opens down; minimum value
c. opens down; maximum value
d. opens down; minimum value
Question 10
Marks: --/10
State whether the opens up or down and whether the y-coordinate ofthe vertex is the minimum or maximum value of the function.

f(x) = -2(x + 4)2 - 3

Choose one answer.
a. opens down; minimum value
b. opens up; maximum value
c. opens down; minimum value
d. opens down; maximum value

What are the phases of a stem cell? List them in order.

angle subtraction formula

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Does anyone know what the best basic electrolyte is for electrochemistry and what is the alternative additives to this electrolyte for removing oxidized layer for example in case of Al electrode?

A pilot is flying over a straight highway. He determines the angles of depression to two mileposts, 7 km apart, to be 36° and 46°, as shown in the figure.

What is the elevation of the plane in meters? Give your answer to the nearest whole number.
height =  meters