A company makes 150 bags. 37 of the bags have buttons but no zips. 45 of the bags have zips but no buttons. 23 of the bags have neither zips nor buttons. How many bags have zips on them?

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

What is the the greatest common factor ?