Math

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Two shirts cost \$12.50. How much will it cost to buy five of the shirts?

Select all the pairs of ratios that form a proportion. Which are:
1/6,4/20 7/9,28/36 14/18,21/27
30/80,6/18.
For which value of m is 4/16=m/24 a proportion?

Solve the proportion. t/16=40/50
Can You Help Me Solve These Problems.

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Two shirts cost \$12.50. How much will it cost to buy five of the shirts?

12.5 * 5 = ?

Select all the pairs of ratios that form a proportion. Which are:
1/6,4/20
7/9,28/36
14/18,21/27
30/80,6/18.

7/9,28/36
14/18,21/27

For which value of m is 4/16=m/24 a proportion

Cross multiply and solve for m.
16m = 96
m = 96 / 16
m = 6

t/16=40/50

Cross multiply and solve for t.

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24/26

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Two shirts cost \$12.50. How much will it cost to buy five of the shirts?

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The total of 5 shirts is 31.25

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thx

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Can someone PLEASE explain to me how to "cross multiply"?!?! I have been to about 20 websites and they tell me to do this, but HOW?!

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i need the answer to the hole QC.