A strand of hair has an average mass of 2.17×10^−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.(1 point)

Answer 1

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

The mass of the grain of rice is 0.002 ounces.
The mass of the strand of hair is 2.17×10^−5 ounces.

To subtract these two quantities, we can write:
0.002 - 2.17×10^−5

To express this result in scientific notation, we need to make sure the number in front of the decimal point is between 1 and 10.

To achieve this, we can convert 0.002 to scientific notation:

0.002 = 2 × 10^-3

Now we can subtract these quantities:

2 × 10^-3 - 2.17×10^-5 = 1.99783 × 10^-3

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

Answer 2

all of the 3 bots answers are different! how do I know which one is right?

Answer 3

hello? bot? what is exactly the answer?