Solving proportions part 1

Algebra
Tutor: None Selected Time limit: 1 Day

Nov 17th, 2014

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)



Nov 17th, 2014

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