Question

Monique needs to buy a baseball for $20, a soccer ball for $15, and a set of tennis balls for $12.

Answer 1

(1 - y)12 represents the price of the set of tennis balls after a coupon was applied.

Answer 2

Let

x---------> discount on a baseball

y---------> discount on a set of tennis balls

z--------> discount on the total purchase

Option A

Applying the coupons x and y

the total purchase is equal to

$(1-x)20+(1-y)12+15$--------> expression A

we know that

In the expression A

$(1-x)20$ -------> represents the price on a baseball after a coupon was applied

$(1-y)12$ -------> represents the price of the set of tennis balls after a coupon was applied

$15$ -------> represents the price of a soccer ball after a coupon was applied

therefore

the answer Part a) is

$(1-y)12$

Option B

Applying the coupon z

the total purchase is equal to

$(1-z)(20+12+15)$--------> expression B

we know that

In the expression B

$(1-z)20$ -------> represents the price on a baseball after a coupon was applied

$(1-z)12$ -------> represents the price of the set of tennis balls after a coupon was applied

$(1-z)15$ -------> represents the price of a soccer ball after a coupon was applied

therefore

the answer Part b) is

$(1-z)12$