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maksim [4K]
3 years ago
15

I need the answer but I don’t quite understand

Mathematics
1 answer:
OleMash [197]3 years ago
7 0

Answer:

r = 90

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

Equality Properties

Step-by-step explanation:

<u>Step 1: Define</u>

(r - 74)/4 = 4

<u>Step 2: Solve for </u><em><u>r</u></em>

  1. Multiply 4 on both sides:                    r - 74 = 16
  2. Add 74 on both sides:                        r = 90
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Explanation:

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3 years ago
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CostB = 30 + .70(miles)

We want to know when A is a better deal or when A costs less. That is when CostA < CostB. We can then substitute the right sides of our equations into the inequality. This will give:

90 + .40(miles) < 30 + .70(miles)     This is where we will now begin to solve for the number of miles.

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60 + .4(miles) < .7(miles)                Simplify

      -.4(miles)   -.4(miles)                Subtract .4(miles) from both sides

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/.3     /.3                                        Divide both sides by .3

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