Question 22649
Make a list of what happened.
Grandma gave her 20
Dad then gave her 4; she now has 20+4
Dad gives her 2nd 4; she now has 20+2(4)
Dad gives her 3rd 4; she now has 20+3(4)
etc.
Notice you do not add as you go along because
you want to see the pattern.
See how this relates to y=20+4x ???

Do you see the Domain? Is it all whole numbers?

Cheers,
Stan H.