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January 31, 2015

January 31, 2015

Posted by **CC** on Wednesday, July 6, 2011 at 10:42pm.

If y varies inversly as the 4th power of x and y=3 when x=2, what is y when x=0.5?

If Q varies inversly as the sqaure root of R and Q=2 whe R=4, what is Q when R is 25?

- Algebra 2 -
**Reiny**, Wednesday, July 6, 2011 at 10:58pm1st one:

y = k(1/x^4)

when x=2, y=3

3 = k(1/16) ---> k = 48

equation: y = 48/x^4

when y = .5

.5 = 48/x^4

x^4 = 96

y = 96^(1/4) = 2(6^(1/4) or appr. 3.13

you try the second one, using the same method

Start with

Q = k/√R

- Algebra 2 -
**CC**, Thursday, July 7, 2011 at 12:42pmis the second one R=625?

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