Question

The U.S. national debt was $2.9617 * 10^13 in 2021 and $3.98 * 10^11 in 1971. Find how much debt increased in the 50-year period.

$3.0015 * 10^13

$2.9219 * 10^13

$1.0183 * 10^24

$2.9219 * 10^11

Answer 1

The size of a hydrogen atom is about 1.2 * 10^-10 m across. The size of an oxygen atom is 0.0000000000152 m across. what is the difference between the sizes of these atoms in scientific notation.

3.2 * 10^-10 m

3.2 * 10^-9 m

3.2 * 10^-11 m

2.72 * 10^-10 m

Answer 2

To find the increase in the national debt over the 50-year period, subtract the debt in 1971 from the debt in 2021.

$2.9617 * 10^13 - $3.98 * 10^11 = $2.9219 * 10^13

Therefore, the debt increased by $2.9219 * 10^13 over the 50-year period.

The correct answer is $2.9219 * 10^13.

Answer 3

To find the difference between the sizes of the hydrogen atom and the oxygen atom, we need to subtract their sizes: 0.0000000000152 - 1.2 * 10^-10.

0.0000000000152 can be written in scientific notation as 1.52 * 10^-11.

So the difference becomes:

1.52 * 10^-11 - 1.2 * 10^-10 = (1.52 - 12) * 10^-11 = -10.48 * 10^-11.

We can simplify this to -1.048 * 10^-10.

Therefore, the difference between the sizes of these atoms in scientific notation is:

-1.048 * 10^-10.

None of the provided answer choices match this result.