Question

Ahmed doubled his savings, then deposited another hundred dollars. Let s represent the amount he originally had in savings. Which shows an expression to represent his current amount and the current value of his account if s=80?

Answer 1

do the opposite of what you did in reverse order.

so add 100 and divide by 2 in that order.

(80 + 100)/2

Answer 2

2 × 80 + 100 = 260

Explanation:

The question says Ahmed

• doubled his savings: we must multiply his savings by 2, hence 2s
• then deposited another hundred dollars: we must add 100 dollars, hence + 100

So the expression for his current amount will be:

Current amount = 2 s + 100

where s represents the initial savings

Given that s = 80 , the current value will be:

Current value = 2 × 80 + 100 = 260