What's 2x-2y=4 in slope intercept form?

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

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