What is one half added to 5 eighths?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

To decrease an amount by 16% what single multiplier would you use

The continuous random variable x is uniformly distributed over the interval [–1,3]. find -e(x) -var(x) -e(x²) -p(x < 1.4) a total of 40 observations of x are made.