answer and show all work please

5. Perform each operation and express the answer to the correct number of significant figures. a. 0.9812+1.660+8.6502= ? b. 189+3,201.81,100= ? c. 675.024+1,190= ? 6. Perform each operation and express the answer to the correct number of significant figures. a. 3.001.9979= ? b. 2,300185= ? c. 16.004.0= ? 7. Convert 3.8105mm into kilometers. Express your final answer in scientific notation. 8. The density of a certain component of crude oil is 1.209 g/mL. What is the volume of 13,500g of this component? 9. What is the density of a dental amalgam (an alloy used to fill cavities) if 1.005kg of the material has a volume of 433 mL ? Express your final answer in grams per milliliter. 10. The average distance between Earth and the sun is 9.3 10mi. How many kilometers is that