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77julia77 [94]
2 years ago
12

X+5≤-4 solve for x: please help me i just need answers

Mathematics
2 answers:
Art [367]2 years ago
5 0

Answer:

4.4 < x

Step-by-step explanation:

Let us break this down so we can understand it.

Step 1: Add 4 & First Answer

4.4 < x

Step 2: Check

0.4 < 4.4 - 4

0.4 < 0.4 Correct

0.4 < 6 - 4

0.4 < 2 Correct

Step 3: Final Answer

Our final answer is 4.4 < x

PLEASE MARK BRAINLIES

mel-nik [20]2 years ago
3 0

Answer:

x ≤ -9

Step-by-step explanation:

x + 5 ≤ -4

x ≤ -9

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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
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Answer:

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Step-by-step explanation:

Let

t ----> the time in seconds

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

we have

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we know that

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so

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The formula to solve a quadratic equation of the form

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

in this problem we have

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

so

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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