Question

a football is kicked vertically upward from a height of 4 feet with an initial speed of 50 feet per second. the formula h = 4 + 50t - 16t^2 describes the balls height above the ground, h, in feet, t seconds after it was kicked. use this formula to find the balls height 3 seconds after it was kicked. the balls height, 3 seconds after it was kicked, was feet.

Explanation:

Step1: Substitute t value

Given $h = 4+50t - 16t^{2}$, substitute $t = 3$.
$h=4 + 50\times3-16\times3^{2}$

Step2: Calculate powers

Calculate $3^{2}=9$.
$h = 4+50\times3 - 16\times9$

Step3: Calculate multiplications

$50\times3 = 150$ and $16\times9=144$.
$h=4 + 150-144$

Step4: Calculate addition and subtraction

$4+150 = 154$, then $154-144 = 10$.
$h = 10$

Answer:

10