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Mkey [24]
3 years ago
7

5) If f(x)=x2-x, what is f(-5)? A. -30 B. -20 C. 20 D. 30

Mathematics
1 answer:
dezoksy [38]3 years ago
7 0
You simply plug it in.

f(x) = x^2 - x
f(-5) = -5^2 - (-5)
f(-5) = -25 - (-5)
f(-5) = -20

hope this was helpful for you.
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If f'(x) = 3(x+5) +-, what is ffa + 2)?
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Answer:

-13/3

Step-by-step explanation:

Let f(x)=A

x=f'(A)

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A=(x-15)/3

f(x)=(x-15)/3

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7 0
3 years ago
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The string of a kite is 100 meters long and it makes an angle of 60° with the ground. What is the height of the kite?
Naddika [18.5K]

Answer:

  50√3 ≈ 86.6 m

Step-by-step explanation:

The geometry can be modeled by a right triangle with the height of the kite being the leg opposite the 60° angle. The hypotenuse has the given length of 100 m.

The mnemonic SOH CAH TOA reminds you that the relation between angles and the sides of interest here is ...

  Sin = Opposite/Hypotenuse

  sin(60°) = (kite height)/(100 m)

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7 0
3 years ago
If i get 20 dollars per 5 minutes for 10 hours how many dollars will i make
rewona [7]

Answer:

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Step-by-step explanation:

600 minutes in 10 hours

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4 0
3 years ago
The length of a rectangle is 4 less than three times its width. The perimeter is 72 feet. What are the dimensions of the rectang
Liono4ka [1.6K]
Say width equals x.
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80=8x
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So width = 10
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8 0
3 years ago
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