Question

The moon is 250,000 miles away. How many feet is it from earth

Answer 1

(250,000 miles) x (5,280 feet/mile) = 1,320,000,000 feet

                                                         ( 1.32 x 10⁹ )

Answer 2

The conversion between miles and feet is:

$1 mi = 5280 ft$

So we can set up a proportion to find how many feet corresponds to 250000 miles:

$1 mi: 5280 ft = 250000 mi :x$

and solving it, we find

$x=\frac{5280 ft \cdot 250000 mi}{1 mi} =1.32 \cdot 10^9 ft$