A grain ofsand a width of 7.2 x 10 − 2. Find the width of nine grains of sand.

Question

A grain of sand a width of 7.2 x 10 − 2. Find the width of nine grains of sand.

Answer 1

9 times 7.2 x 10^-2 is (9)(7.2 x 10^-2)

 

                           = (9)(7.2) x 10^-2

 

                           = 64.8 x 10^-2

 

                           = 0.648

 

                           =6.48 x 10^-1