Answer:
1- Let x = original price then
x - .20x = 48
x(1 - .20) = 48
x(.80) = 48
x = 48/.80
x = $60
2-Let "x" be the number of lessons.
240 - 15x = 0
240 = 15x
x = 16 lessons
3-divide equation by 2:
(2W-4) + W = 32
2W - 4 + W = 32
2W + W = 32 + 4
3W = 36
W = 36/3
W = 12 cm
Find the Length using L = 2W-4:
L = 2(12) - 4
L = 20 cm
Check: 2(20) + 2(12) = 64
4-P stands for the original price. The 90 stands for 90 %. Wendy paid 100-10, or 90 %.
Explanation: