Create a budget that will allow you to save at least $100 by the end of October

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Witch represents the inverse of the function f(x)=1/4x-12

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)