Step-by-step explanation:
x=20
y=100
solution in image
Answer:
The diagram reprents the 3 sets and the universal set . The shaded portion clearly can be seen as :

Shaded region = 
Try to understand some what complex
Answer:
when she sold 10 cards, it will cover all her cost.
Step-by-step explanation:
Profit(without charge of booth)=5x-2x
Profit=3x-30
Calculating:
3x=30
x=10
(12+9x) - (6+3x) + 6x + -3
6+3x + 6x+-3
3+ 9x