allisonhall0925
11.07.2019 •
Mathematics
If y is a positive integer, for how many different values of y is cubed square root of 144/y a whole number? a. 1 b. 2 c. 6 d. 15
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Ответ:
b. 2
step-by-step explanation:
144 = 2^4 · 3^2 = 2^3 · (2·3^2)
in order for 144/y to be a perfect cube, it must be either 2^3 or 1. that is, the values of y that make 144/y be a perfect cube are 18 or 144.
there are 2 values of y that make ∛(144/y) a whole number.
Ответ:
Example: 3x+4x=7x
x is the variable