7+2/5x=1 i don't know how to do this problem

The circumference of a circle is 60 pi cm3what is the radius of the circle

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

What is the prime factorization of 23 ?me with this question