13. Cross multiply: 2 (f +3) = 7 * 12

2f + 6 = 84

2f + 6 - 6 = 84 - 6 (subtract 6 from both sides)

2f = 78

f = 39 (78 divided by 2)

14. Cross Multiply: -2d = 3 * 5

-2d = 15

d = -15/2 or -7 and 1/2

16. Cross Multiply -4x = 7 * 9

-4x = 63

x = -15.75

17. s - 2 = 21 (when cross multiplied)

s = 23 (add 2 to both sides)

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