need help in chemistry 100

What is 16.2 μm in m? (1.62x10-5 m or 0.0000162 m)

What is 10.5 gallons in L given 1 gal = 3.78 L? (39.7) L)

What is 2.2 lb in kg given 1 lb = 454 g? (1.0) kg)

) Write the solution map for converting cm into mm (cm → m → mm)

) Convert 17 cm into mm (170 mm)

Write the solution map for converting miles to km (miles → km))

Convert 100 miles into km given that 1 km = 0.621 miles (161 km))

Write the solution map for converting miles/hr to feet/s (mi/hr → ft/hr → ft/s))

Convert 60 miles/hr into feet/s given that 1 foot = 1.89x10-4 miles) (88 feet/s))

Does 12,000 have 2 or 5 significant figures

Report the average of 9.2, 9.45 and 9.003 with the correct number of significant figures

This answer should have 1 d.p. (or 3 s.f. in this case) but don’t round yet!

Report the average of 9.2, 9.45 and 9.003 with the correct number of significant figures

Report 9.55 + 1 with the correct number of significant figures

Note that the answer has 2 s.f. but one of the original numbers only has 1 s.f.

This is an explanation question in two parts

What is dimensional analysis?

Why is dimensional analysis useful? Briefly explain the process of dimensional analysis and why it is useful