Provide the answer with the appropriate number of significant figures.

a

.

6.03 x 650

b

.

2.7 x 1031.645

c

.

3.000 + 7.61 + 124.2

d

.

(3.55 x 10

9

) x (9.5 x 10

-7

)

e

.

7.845 - 1.20

f

.

7.845 - 1.2

g

.

(6.72 x 10

6

) - (4.32 x 10

4

)