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Orlov [11]
3 years ago
10

William got $150 for making all A’s on his report card. He wants to spend it on CDs and DVDs. The local video store is having a

sale; all CDs are $10 and all DVDs are $15. Which of the following is a possible combination of CDs and DVDs?
Mathematics
1 answer:
olga55 [171]3 years ago
3 0
What are the options?

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What is the surface area of the cylinder?
Aleks04 [339]

Step-by-step explanation:

A=2πrh+2πr2 ans for 1 one

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Solve using the substitution method:<br><br> 6x + y =15<br> 4x + 3y = 31
Ksivusya [100]

Answer:

the answers to this are x= 1 and y= 9

3 0
2 years ago
Katie is twice as old as her sister Mara. The sum of their ages is 24. Find their ages.
Alenkasestr [34]
So k=katie's' age
m=mara's age

k is 2 times as old as m
k=2m

sum is 24
add means sum
k+m=24

so we have
k+m=24 and
k=2m
subsitute
2m+m=24
add
3m=24
divide both sides by 3
m=8
subsitute again
k=2m
k=2(8)
k=16

katie=16
mara=8
4 0
3 years ago
It cost Naomi $7.70 to send 154 text messages. How many text messages did she send
s2008m [1.1K]

You have to find the unit rate

SO..

7.70 / 154 = 0.05

So it cost her 0.05 cents for each text.

So then you divide $ 5.25 by the unit rate to get the number of text

5.25 /0.05 = 105

so she sent 105 text

To check it you just multiply the unit rate by the number of text you got and you show come up with $ 5.25

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4 0
3 years ago
3(4x-9)&gt;=2x+12<br> &gt;= is greater than equal to
ValentinkaMS [17]
12x-27=2x+12
10x-27=12
10x=39
x=3.9
5 0
3 years ago
Read 2 more answers
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