Need answers to the questions on picture

Additional Problems 1. Express the following quantities in scientific notation: a. 158 000 km 1.58 X10 LO 0.000 000 006 13 m X10 b. 0.000 009 782 L 9.78: X10 LD 12 552 000 J X10 c. 837 100 000 cm 8.37: X10 0.000 008 004 g/L X10 d. 6 500 000 000 mr X10 0.010 995 kg X10 e. 0.005 93 g X10 1 050 000 000 Hz X10 2. Perform the following calculations, and express the result in scientific notation with the correct number of significant figures: a. 2.48 x 10' kg + 9.17 x 10' kg + 7.2 x 10' kg X10 b. 4.07 x 10"' mg + 3.966 x 10" mg + 7.1 x 10" mg X10 c. 1.39 x 10* m' + 6.52 x 10' m' - 4.8 x 10' m' X10