Quadratic Functions

Question 1

The function C(x) = 400x – 0.2x2 represents the total costs for a company to produce a product, where C is the total cost in dollars and x is the number of units sold. Which statement is true?

Revolt · Accepted Answer

One thousand units have the maximum cost of $200,000.

Question 2

Which function is a quadratic function?

Revolt · Accepted Answer

u(x) = –x + 3x2 – 8

Question 3

Which function is a quadratic function?

Revolt · Accepted Answer

h(t) = 12 – t + 6t2

Question 4

The cost, C, to produce b baseball bats per day is modeled by the function C(b) = 0.06b2 – 7.2b + 390. What number of bats should be produced to keep costs at a minimum?

Revolt · Accepted Answer

60 bats

Question 5

What is the equation of the axis of symmetry of the graph of ?

Revolt · Accepted Answer

mc003-3.jpg

Question 6

What is the vertex and the equation of the axis of symmetry of the graph of ?

Revolt · Accepted Answer

vertex: (3,–16)a.o.s: x = 3

Question 7

Which function is a quadratic function?

Revolt · Accepted Answer

h(x) = 3x(x – 2) – 4

Question 8

The height of a baseball hit from a bat is modeled by a quadratic function of time, h(t). What does the second coordinate of the vertex of the quadratic function represent?

Revolt · Accepted Answer

the maximum height of the baseball

Question 9

The axis of symmetry of a quadratic equation is x = –3. If one of the zeroes of the equation is 4, what is the other zero?

Revolt · Accepted Answer

–10

Question 10

The height of an arch is modeled by the equation . Which of the following gives the width of the arch at its base?

Revolt · Accepted Answer

the difference between the zeroes

Quadratic Functions Answers

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