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

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

Question 2

The path of a football kicked by a field goal kicker can be modeled by the equation y = –0.04x2 + 1.56x, where x is the horizontal distance in yards and y is the corresponding height in yards. What is the approximate maximum height of the football?

Revolt · Accepted Answer

A: 15.21 yd

Question 3

Which function is a quadratic function?

Revolt · Accepted Answer

A: u(x) = –x + 3x2 – 8

Question 4

Which function is a quadratic function?

Revolt · Accepted Answer

C: p(x) = –5x – x2

Question 5

Which function is a quadratic function?

Revolt · Accepted Answer

D: h(t) = 12 – t + 6t2

Question 6

What is the vertex of the graph of y = x2 + 4x?

Revolt · Accepted Answer

D: (–2, –4)

Question 7

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

B: 60 bats

Question 8

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

Revolt · Accepted Answer

B: mc003-3.jpg

Question 9

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

Revolt · Accepted Answer

C: vertex: (3,–16)a.o.s: x = 3

Question 10

What is the axis of symmetry for the graph of y – 4x = 7 – x2 ?

Quadratic Functions Answers

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