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) Amir is saving money to buy an MP3 player that costs
$120. He starts with $25, and each week he saves $9.
The expression 25 + 9w gives the amount in dollars
that Amir will have saved after w weeks.
[tex]25+9w[/tex]
Set the expression. We don't know yet how much does that worth.
a) How much will Amir have saved after 8 weeks?
Replace 8 for w:
[tex]25+9w\\25+9(8)\\25+72\\97[/tex]
$97 in 8 weeks.
2) After how many weeks will Amir have saved enough money to buy the MP3 player?
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)