2.1 times 10 to the power of 17 =(3 times 10 to the power of 10) (7 times 10 n)

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?