Gavin's mean score on 3 math tests is 87. what equation can be solved to find x, the score he needs on his next test to bring his mean score up to 90?

What is the measure of the smallest angle in the diagram? 15 29 32 45

What are the excluded values? m+5/mn+3m

The diameter of the moon is about 3500 km. approximate the surface area of the moon using the formula for the surface area of a sphere, s = 4πr2. write your answer in scientific notation.