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# Lee J.

## Former college math/statistics instructor

### Tacoma, WA (98433)

Hourly fee \$45.00
Save up to 15%
 You don't pay for tutoring unless you find a good fit! You don't pay for tutoring unless you find a good fit!

# how do you simplify x^3-8/x^2-4? (answer)

It suppose to be (x^3-8)/(x^2-4)   x^3-8 = (x-2)(x^2+2x+4) x^2-4 = (x-2)(x+2) therefore, (x^3-8)/(x^2-4) = (x^2+2x+4)/(x+2)  <-- (x-2) cancelled out. The answer is (x^2+2x+4)/(x+2)     Lee

# Compute the mean and variances of the following discrete probability and distribution. (answer)

mean = sum of x*P(x) = 2x0.50 + 8x0.30 + 10x0.20 = 5.40 variance = sum of x^2*P(x) - mean^2 = 2^2*0.50 + 8^2*0.30 + 10^2*0.20 - (5.40)^2 = 2.00 + 19.20 + 20.00 - 29.16 = 12.04   I hope you understand how the answer came out.   Lee

### Lee's Hourly Rate

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