Answer:
1
Step-by-step explanation:
9 (x + 9) = 90
(x + 9) = 90/9
x + 9 = 10
x = 10 - 9
x = 1
x= 1
expand brackets
9x + 81 = 90
-81 = -81
9x = 9
divide by 9 = and divide by 9
$29.25
35% if 45 is 15.75 and then 45-15.75=29.25