How many inches is #"7 cm"#?

1 Answer
Jan 16, 2018

#"7cm"##~~##"2.76 inches"# rounded to two decimal places

Explanation:

Use dimensional analysis.

#"1 in"##=##"2.54 cm"#

This gives us two conversion factors:

#"1 in"/"2.54cm"# and #"2.54 cm"/("1 in")#

Multiply #"7 cm"# by the conversion factor with inches in the numerator.

#7color(red)cancel(color(black)("cm"))xx("1 in")/(2.54color(red)cancel(color(black)("cm")))="2.76 in"# (rounded to two decimal places)