Question

Three-Step Conversion:Significant Figures are requiredHow many cm is 4.0 mi? (Remember your answer need to have the correct amount of significant figures and the correct units written).(1 mi = 5280 ft, 1 in=2.54 cm) (hint: cm -> in -> ft -> mi)

Answer 1

First, we need to transform 4mi to ft

we know

1mi=5280ft

`4mi=4(5280)=21120ft`

then we got 21120 ft to inches

1ft=12 in

`21120ft=21120(12)=253440in`

then we got 253440in to cm

1 in=2.54 cm

`253440in=253440(2.54)=643737.6\text{ cm}`

therefore the solution is

4.0mi= 643737.6 cm