Question

Lindsey started a savings account with $260. After 4 weeks, she has $315 dollars. After

8 weeks, she had $370. What is the rate of change of money in her savings account per
week?

Answer 1

$13.75

Explanation:

0 weeks = 260

4 weeks = 315

8 weeks = 370

Every 4 weeks, the rate of change is $55 as can be seen by 315 - 260 = 55 and 370 - 315 = 55.

Per week, the rate of change is $13.75 This is because $55 ÷ 4 weeks = rate of change per week

55 ÷ 4 = 13.75