What is 100/225 in it's lowest form?

If tana tanb=k, show that(1+k)cos(a+b)=(1-k)cos(a-b)

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.