PLEASE HELP I GIVE THANKS

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

Evaluate the function , when d = {9, 15, 30}. r = {5, 7, 12} r = {6, 10, 15} r = {6, 10, 20} r = {5, 12, 20}