A store offers a 10% discount and a $20 off coupon. What is the discount equation and the coupon equation?
Function Composition Word Problems

Quiz
•
Mathematics
•
11th Grade
•
Hard
Sarah Woodson
Used 4+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
d(x) = 0.1(x)
c(x) = x - 20
d(x) = 0.1(x)
c(x) = 20 - x
d(x) = 0.9(x)
c(x) = 20 - x
d(x) = 0.9(x)
c(x) = x - 20
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A store offers a 10% discount and a $20 off coupon. What is the cost equation if the discount is applied BEFORE the coupon?
f(x) = .9x - 18
f(x) = .9x - 20
f(x) = .1x - 20
f(x) = .1x - 18
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A store offers a 10% discount and a $20 off coupon. What is the cost equation if the coupon is applied BEFORE the discount?
f(x) = .9x - 18
f(x) = .9x - 20
f(x) = .1x - 20
f(x) = .1x - 18
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
You go shopping for jeans with a coupon for $5 off. When you arrive, you find all jeans are also on sale for 25% off. Let j = the price of jeans.
Find C(j), the cost for jeans when you only use the coupon,
D(j), the cost for jeans when you only use the discount, and then
select the composition, D(C(j)) or C(D(j)) that will save you the most money.
C(j) = j - 5
D(j) = .75j
C(D(j)) = .75j-5
C(j) = j - 5
D(j) = .25j
D(C(j)) = .25(j-5)
C(j) = j - .75
D(j) = 5j
C(D(j)) = 5j-.75
C(j) = j - 5
D(j) = .75j
D(C(j)) = .75(j-5)
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
You have a $50-off coupon and there was a 10%-off sale on a new $1000 stereo. If C(x) is the cost to purchase a stereo with only the coupon and D(x) is the cost to purchase the stereo with only the discount, which composition will give you the most savings? Find the composition and the savings.
C(D(x)) = .9x-50 will save $150.
D(C(x)) = .9(x-50)
will save $145.
C(D(x)) = .1x-50 will save $150.
D(C(x)) = 1.(x-50)
will save $145.
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The volume of water in a tank (in gallons) is given by V = 9 - t, where t is the time passed in hours.
The weight of the tank (in pounds) is given by W = 2V, where V is the volume in gallons.
Write an equation for the weight of the tank in terms of the time passed.
W = 2(9 - t)
W = 9 - 2t
W = 18 - t
Not enough information
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A store offers a 15% discount and a $30 off coupon. What is the cost equation if the coupon is applied BEFORE the discount?
f(x) = .15x - 25.5
f(x) = .85x - 25.5
f(x) = .15x - 30
f(x) = .85x - 30
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