12. Determine which ratio forms a proportion with 15/8 by using cross products.
A. 25/16
B. 30/12
C. 60/32
D. 75/32

13. Which ratios can form a proportion?
A. 9/45, 8/40
B. 8/12, 12/21
C. 8/12, 12/15
D. 9/22, 14/28

14. Drinking 7 fluid ounces of milk provides 236.25 milligrams of calcium. How many fluid ounces of milk are required to provide 67.5 milligrams of calcium? Round to the nearest tenth.
A. 1.7 fluid ounces
B. 2.0 fluid ounces
C. 2.5 fluid ounces
D. 2.3 fluid ounces

Explanation: when you divide 236.25 by 7 you get 33.75 and then multiply that by 2 and you get 67.7 so you know 2 fluid ounces of milk contain 67.7 mg of calcium

sorry i couldnt answer 13

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jajumonac jajumonac · Answer 2 · 2019-12-30T18:33:02+01:00

Answer:

12.

Ratios that can form a proportion with 15/8 are those that are equivalent fractions. In this case, 60/32 can form a proportion with 15/8, because they are equivalent, if we simplify 60/32 we would have 15/8, because 60/4=15 and 32/4=8.

Therefore, the right answer is C.

13.

Here we apply the same definition, a proportion is an equality between two fractions. In this case, the ratios that can form a proportion are A. 9/45, 8/40, because both fractions are equivalent to 0.2.

14.

To solve this problem, we can apply the rule of three, if 7 ounces of milk provides 236.25 milligrams of calcium, how many ounces of milf would provide 67.5 milligrams of calcium.

[tex]67.6 \ mgCa\frac{7 \ oz}{236.25 \ mgCa}= 2.00 oz[/tex]

Therefore, the right answer is B.