The mass of a dust particle is approximately 7.5×10^−10
kilograms and the mass of an electron is 9.1×10^−31
kilograms. Which expression would you use to find out how many electrons you need to equal the mass of one dust particle?
A. (7.5×10^−10)÷(9.1×10^−31)
B. (9.1×10^−31)÷(7.5×10^−10)
C. (7.5×10^−10)(9.1×10^−31)
D. (9.1×10^−31)(7.5×10^−10)
E. (9.1×10^−31)−(7.5×10^−10)