Question

Which expression represents the amount of money in Frank's account?
Frank deposits $20 a week into his bank account for several weeks

Answer 1

Let number of weeks be x.

• Frank deposits every week=$20

So the function is given by

$\\ \sf\longmapsto f(x)=20x$

Balance in first month

$\\ \sf\longmapsto f(1)=20(1)=20$

In second month

$\\ \sf\longmapsto f(2)=20(2)=40$

And so on