Question

For every dollar that Katie earns, she saves 0.40. Katie uses the function rule s= 0.4d, where s represents the amount case saves in Dollars into represents dollars earned.how much money did Katie earn if she saved 24.80?

Answer 1

The expression that Katie uses is:

`s=0.4d`

Where "s" is the amount saved, and "d" is the dollars earned by Katie.

We are asked to find the amount earned if she saved 24.80. Those 24.80 will be the value of "s":

`s=24.80`

The first step is to substitute s=24.80 into the given expression:

`\begin{gathered} s=0.4d \\ \text{substituting s=24.80} \\ 24.80=0.4d \end{gathered}`

The next step will be to solve for "d", the amount earned, by dividing both sides of the equation by 0.4:

`\begin{gathered} (24.80)/(0.4)=(0.4d)/(0.4) \\ 62=d \end{gathered}`

Katie earned 62 dollars.

Answer: 62