The Quadratic Formula

Question 1

Determine the value of v, rounded to the nearest whole number.

Revolt · Accepted Answer

56

Question 2

Which quadratic equation models the situation correctly?

Revolt · Accepted Answer

h(t) = –16t2 + 56t + 6.5

Question 3

Again, the quarterback throws the football, but this time the model y = –16x2 + 35x + 6.5 describes the height (y), in feet, of the football x seconds after it is thrown. If the ball is not caught, how long will it be in the air?0 = –16x2 + 35x + 6.5x = Rounded to the nearest tenth, the solutions of the equation are .

Revolt · Accepted Answer

-0.2, 2.4

Question 4

To the nearest tenth of a second, the ball is in the air for s.

Revolt · Accepted Answer

2.4

Question 5

To determine the value of f, substitute a pair of values for d and v into the equation and solve. Rounded to the nearest hundredth.

Revolt · Accepted Answer

0.35

Question 6

What is the value of a?

Revolt · Accepted Answer

0.0048

Question 7

Why can you eliminate the solution of -0.2 in the context of this problem? Check all that apply.

Revolt · Accepted Answer

It does not make sense for time to be negative.; The ball cannot hit the ground before it is thrown.

Question 8

Which quadratic equation models the situation correctly?

Revolt · Accepted Answer

d(v) = 2.15v² / 22.54

Question 9

Which quadratic equation models the main cable of the bridge correctly?

Revolt · Accepted Answer

y = 0.0048(x – 50)2 + 6

The Quadratic Formula Answers

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