?what should i put ?

Which of the greatest common gcf of 32 and 48 a 16 b 96 c 8 d 32

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?

Solve the system of equations y= 3/2 - 1, -x+ y =-3