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Molodets [167]
3 years ago
11

7d+5−4d simplify the expression

Mathematics
1 answer:
ch4aika [34]3 years ago
6 0

Answer:

3d + 5

General Formulas and Concepts:

  • Combining like terms

Step-by-step explanation:

<u>Step 1: Define expression</u>

7d + 5 - 4d

<u>Step 2: Simplify</u>

  1. Combine like terms:                       3d + 5
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If you add 21 to my number and then multiply the result by 3, you will get 84 more than two-thirds of my number. Find my number.
Ksivusya [100]

Based on the calculations, the unknown number is equal to \frac{-45}{7}

  • Let the unknown number be x.

<h3>How to find an unknown number:</h3>

Translate the word problem into an algebraic expression, we have;

Adding 21 to the unknown number:

21 +x

Multiplying the result by 3:

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Equating the equations, we have:

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Cross-multiplying, we have:

43+3x=\frac{2x}{3} +84\\\\129+9x=2x+84\\\\9x-2x=84-129\\\\7x=-45\\\\x=\frac{-45}{7}

Read more on word problems here: brainly.com/question/13170908

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3 years ago
Sharon read a 300-page book. She read at a rate of 15 pages per day in d days. Write an equation to describe this situation.​
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Answer:

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Step-by-step explanation:

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