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Digiron [165]
3 years ago
13

Need answer ASAP please help

Mathematics
1 answer:
Step2247 [10]3 years ago
8 0

Answer:

B

Step-by-step explanation:

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3 years ago
Martin throws a ball straight up in the air. the equation h(t) = -16t^2 + 40t + 5 gives the height of the ball, in feet, t secon
Lisa [10]

Answer:

2.62 seconds

Step-by-step explanation:

Let

t ----> the time in seconds

h(t) ----> he height of the ball, in feet

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h(t)=-16t^2+40t+5

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When the ball hits the ground, the height is equal to zero

so

-16t^2+40t+5=0

The formula to solve a quadratic equation of the form

at^{2} +bt+c=0

is equal to

t=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}

in this problem we have

-16t^2+40t+5=0

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a=-16\\b=40\\c=5

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3 years ago
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