Evaluate each expression. Express your answer in scientific notation.

(1.5 x 10^2) (5x10^10)

4.8 x 10^-8 / 3x10^-3

(5 x 10^8) (4x10^3)

(7.2x10^3) : (1.2 x 10^5)

Step-by-step explanation:

To simplify

(1.5*10^2) (5*10^10)

(1.5*5) * 10^2*10^10

7.5*10^12

To simplify 4.8*10^-8:3*10^-3

(4.8:3) * 10^-8+3

1.6*10^-5

To simplify

5*10^8*4*10^3

(5*4) * 10^8*10^3

20*10^11

2.0*10^1*10^11

2.0*10^12

To find

7.2*10^3:1.2*10^5

(7.2:1.2) * 10^3-5

6*10^-2