9. well to set it up you would start with making an equation.
$7.95x + $8.95x = $1036.75
then you would combine like terms and divide.
7.95+ 8.95= $16.90
then you would divide $1036.75 by $16.90
=$66.46
10. complementary means both =90o
start by dividing 90 by 2= 45
then it says 12 less then twice the measure
so 45*2= 90 and 90- 12 is 78
so angle 1 = 45
angle 2 = 33