You can square the whole problem to cancel out the square root. Might make things easier.
-5f, -8c, 40f, 10c happy math..ing
She will have $500 in 5 days because when she takes out the 20 every week she will have had $100 so to make $500 she will have to have made 5 $100
Answer:
2.26666666667 is the answer