Evaluate the following. Write your answers in a standard form.
a) (4.8 x 10^5)/(1.2 x 10^2)
b) (6 x 10^3) x (4 x 10^7)
c) (7.1 x 10^6) - (5.9 x 10^6)
d) (1.6 x 10^4) + (8.3 x 10^4)
a) (4.8 x 10^5)/(1.2 x 10^2) = 4 x 10^3
b) (6 x 10^3) x (4 x 10^7) = 2.4 x 10^11
c) (7.1 x 10^6) - (5.9 x 10^6) = 1.2 x 10^6
d) (1.6 x 10^4) + (8.3 x 10^4) = 9.9 x 10^4