A strand of hair has an average mass of 2.17 x 10^-5 ounces. A grain of rice has an average mass of 0.002 ounces. How much heavier is a grain of rice than a strand of hair? Express your answer in scientific notation.

Answer 1

To find the difference in mass between a grain of rice and a strand of hair, we subtract the mass of the hair from the mass of the grain of rice.

Mass of grain of rice = 0.002 ounces
Mass of strand of hair = 2.17 x 10^-5 ounces

Difference in mass = 0.002 - 2.17 x 10^-5
= 0.00199783 ounces

Since 0.00199783 is between 1 and 10, we can write it in scientific notation as 1.99783 x 10^-3.

Therefore, a grain of rice is 1.99783 x 10^-3 ounces heavier than a strand of hair.

Answer 2

Is that correct?