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tiny-mole [99]
3 years ago
8

Evaluate each expression when x=2, y=-5 and z=3 xy-z

Mathematics
1 answer:
gulaghasi [49]3 years ago
8 0

when x=2, y=-5 and z=3

xy-z


2(-5)-3

-10-3

-13

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Tell whether -3 is a solution of the inequality <br>3-4r &gt;_ 15<br>​
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Answer:

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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

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtraction Property of Equality<u> </u>

Step-by-step explanation:

<u>Step 1: Define</u>

3 - 4r ≥ 15

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

  1. [Subtraction Property of Equality] Subtract 3 on both sides:                        -4r ≥ 12
  2. [Division Property of Equality] Divide -4 on both sides:                                r ≤ -3

<u>Step 3: Compare</u>

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This is true. -3 is less than <em>or equal to</em> -3.

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