Which is the smallest number out of 4, -12, 17 and -24?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of