Evaluate Algebraic Expressions and formulas 7.5 lesson
1 answer:
Answer:
1)$97 in 8 weeks. 2) 11 weeks.
- Addition, Multiplication
- Follow the acronym PEMDA Power, Multiplication, Division, Addition (Subtraction)
Step-by-step explanation:
1) <em>Amir is saving money to buy an MP3 player that costs </em>
<em>$120. He starts with $25, and each week he saves $9. </em>
<em>The expression 25 + 9w gives the amount in dollars </em>
<em>that Amir will have saved after w weeks</em><em>.</em>
<em /><em />
Set the expression. We don't know yet how much does that worth.
<em>a) How much will Amir have saved after 8 weeks?</em>
Replace 8 for w:
$97 in 8 weeks.
2) <em>After how many weeks will Amir have saved enough money to buy the MP3 player?</em>
Week | Value of 25 + 9w |Amount Saved
9 |25 + 9 × (9) = 25 + 81= 106
10 |25 + 9 × (10) = 25 +90= 115
11 |25 + 9 × 11 = 25 + 99= 124
Answer: After 11 weeks
- Which operations does the expression 25 + 9w include?
Addition, Multiplication
- In what order should you perform the operations?
Follow the acronym PEMDA Power, Multiplication, Division, Addition (Subtraction)
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