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emmainna [20.7K]
3 years ago
11

Find f(3) for f(x)=−5x−2 A. -10 B. -15 C. 13 D. -17

Mathematics
1 answer:
Travka [436]3 years ago
4 0

Answer:

f(3) = -17

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Algebra I</u>

  • Function Notation

Step-by-step explanation:

<u>Step 1: Define</u>

f(x) = -5x - 2

f(3) is x = 3

<u>Step 2: Evaluate</u>

  1. Substitute in <em>x</em>:                    f(3) = -5(3) - 2
  2. Multiply:                               f(3) = -15 - 2
  3. Subtract:                              f(3) = -17
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How many pounds of a 23% zinc alloy must be mixed with a 42% zinc alloy to make 516 pounds of a 37.25% zinc alloy?
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Answer:

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Step-by-step explanation:

Let x be the number of 23% zink alloy

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