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Reika [66]
3 years ago
11

a hiker climbs down a 90 foot hill in five minutes what is his average change in elevation per minute

Mathematics
1 answer:
andrey2020 [161]3 years ago
3 0

90 feet/5 minutes = 18 feet per minute

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Measure to the correct location on the imaige not all angle measures will be used
Ilia_Sergeevich [38]

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Given ƒ(x) = 9x + 54, find x when ƒ(x) = 18. <br> A)−6 B)−4 C)3 D)8
Katen [24]

Answer:

B. -4

Step-by-step explanation:

We want to find x such that f(x)=18.

We need to therefore solve 9x+54=18 forx.

9x+54=18

Divide both sides by 9:

(9x+54)/9=18/9

9x/9+54/9=18/9

Simplify:

x+6=2

Subtract 6 on both sides:

x=2-6

Simplify

x=-4.

So f(-4) should have value 18.

Let's check.

f(x)=9x+54

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f(-4)=-36+54

f(-4)=18

So the answer is B.

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ankoles [38]
87 is a composite number 
5 0
3 years ago
Read 2 more answers
55 points see attachment below
Ludmilka [50]

Answer:

  f(3) = -20

Step-by-step explanation:

To find the value of a function, substitute the number for the variable and do the arithmetic.

  f(x) = -2x^2 +x -5 . . . . . . given

  f(3) = -2(3^2) +(3) -5 . . . . function value for x = 3

  f(3) = -2(9) +3 -5 = -18 +3 -5

  f(3) = -20

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