Which addition expression has the sum 8 - 3i ?
(9 + 2i) + (1 - i)
(9 + 4i) + (-1 - 71)
(7 + 2i) + (1 - 1)
(7 + 4i) + (-1 - 71)

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

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

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?