Use the equation 8+x+(-5)=(-4)+x+7

Option 1: $30 an hour plus a nonrefundable deposit of $50 option 2: $20 an hour plus a nonrefundable deposit of $75 kyle is renting a jetski for the day. if he can rent the jetski in one hour increments, what is the minimum number of hours must he rent the jetski for option 2 to be a better deal then option 1?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Which of the following parabolas opens down?