1. 3x+9-9=18-9
3x=9
x=3
2. 4x-12=20
4x-12+12=20+12
4x=32
x=8
3. x+0-0
x=0
4. x/2-2+2=9+2
x/2=11
(2)(x/2)=11(2)
x=22
5. 12x-21=3
12x-21+21=3+21
12x=24
x=2
6. 3x-15=18
3x-15+15=18+15
3x=33
x=11
7. 3x-25=14
3x-25+25=14+25
x=13
8. 3x+16=22
3x+16-16=22-16
x=2
9. 2x-8=2
2x-8+8=2+8
2x=10
x=5
10. 9x-18=9
9x-18+18=9+18
9x=27
x=3
11. x+0=0
x=0
12. 9x-8=19
9x-8+8=19+8
9x=27
x=3
If you want to check my answers
use substitution method by using the x into for each equation.
Seven weeks until they meet again
The amount paid by Lynn is $ 53.33
<em><u>Solution:</u></em>
Given that, Lynn was shopping and found a purse that was marked with a discount of
off
Original cost of purse = $ 80
<em><u>To find: Amount paid by Lynn</u></em>
Discount = 
Therefore, discount price is given as:

Thus discount price = $ 26.67
<em><u>Amount paid by Lynn:</u></em>
Amount paid = original price - discount price
Amount paid = 80 - 26.67 = 53.33
Thus amount paid by Lynn is $ 53.33
Firstly triangle OAB is equilateral so R = AB =OA = 8 in
MES (ARC AB) = R x Ф (in Radian). Note that 60° =π/3
MES (ARC AB) = 8 x π/3 (D)