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svlad2 [7]
2 years ago
11

F (x) = x^2 + 4x; Find f (−7)

Mathematics
1 answer:
elena-14-01-66 [18.8K]2 years ago
4 0

Answer:

f(-7) = 21

General Formulas and Concepts:

<u>Pre-Alg</u>

  • Order of Operations: BPEMDAS

Step-by-step explanation:

<u>Step 1: Define</u>

f(x) = x² + 4x

f(-7) is x = -7

<u>Step 2: Solve</u>

  1. Substitute:                    f(-7) = (-7)² + 4(-7)
  2. Evaluate:                       f(-7) = 49 + 4(-7)
  3. Multiply:                        f(-7) = 49 - 28
  4. Subtract:                       f(-7) = 21
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small bottles to medium =  2 : 3

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M is the unknown, so to find how many medium bottles that has been made,  we must cross multiply

2M = 3s

M = \frac{3s}{2}  medium bottles made every minute

medium bottles to large bottles =  3 : 5

medium bottles to large bottles =  M : L

where M = \frac{3s}{2}

The equation becomes:

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L is the unknown, so to find how many Large bottles that has been made,  we must cross multiply

3L =( \frac{3s}{2} ) * 5

L = (\frac{15s}{2} /3})

L = ( \frac{5}{2} s)

L = 2.5 s

therefore the large bottles the company makes every minute is 2.5s large bottles

we can conclude that the expression for the number of large bottles the company makes every minute with respect to s is : L = 2.5 s

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Step-by-step explanation:

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Answer:

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From (1), x=60-y

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