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3 years ago

7z+15+27, z, plus, 15, plus, 2

Mathematics

1 answer:

ANEK [815]3 years ago

7 0

Answer:

$7z + 15 + 27 \\ 7z + 42 \\ z = 42 \div 7 \\ z = 6$

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Answer:

f(x) = x² - 4x - 12

Step-by-step explanation:

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3 0

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

we have

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

we know that

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

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

The formula to solve a quadratic equation of the form

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is equal to

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

in this problem we have

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

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

substitute in the formula

$t=\frac{-40\pm\sqrt{40^{2}-4(-16)(5)}} {2(-16)}$

$t=\frac{-40\pm\sqrt{1,920}} {-32}$

$t=\frac{-40+\sqrt{1,920}} {-32}=-0.12\ sec$

$t=\frac{-40-\sqrt{1,920}} {-32}=2.62\ sec$

therefore

The solution is t=2.62 seconds

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3 years ago

What is the volume of a sphere that has a diameter of 12

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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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