5. Perform the following operations. Express each answer in scientific notation.
a. (1.54 x 10 -2 g) + (2.86 x 10-1 g)
b. (7.023 x 109 g) -(6.62 x 107g)
c. (8.99 × 10 -4 m) x (3.57 x 104 m)
2.17 x 10-3g
d.
5.002 x 104 mL