A student received a coupon for 11% off the total purchase price at a clothing store. Let z be the original price of the purchase. Use the expression below for the new price of the purchase. Write an
equivalent expression by combining like terms.
Z-0.112
Z-0.117=

  0.89z

Think of it like 100% - 11% = 89%

You save 11%, so you need to pay the remaining 89%

Taking 89% of z then leads to 0.89z

So that's why z - 0.11z = 0.89z

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9