kayranicole1
02.07.2019 •
Mathematics
Solve. 4/7 = 21/ x - 3a. x = 15b. x = 94c. x = 39 3/4d. x = 12 3/7
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Ответ:
4/7 = 21/ (x - 3)
multiply by (x-3) on each side
4(x-3)/7 =21
multiply by 7 on each side
4(x-3) = 21*7
distribute
4x-12 = 147
add 12 to each side
4x = 159
divide by 4
x = 159/4
change back to a mixed number
4 goes into 159 39 times with 3 left over
39 3/4
Choice C
Ответ: