The amount of interest he would earn in one (1) year is equal to $80.
<u>Given the following data:</u>
- Interest rate = 10% = 0.1
To determine how much interest he would earn in one (1) year:
<h3>How to calculate
simple interest</h3>
Mathematically, simple interest is given by this formula:

<u>Where:</u>
- S.I is the simple interest.
- P is the principal or starting amount.
- T is the time measured in years.
Substituting the given parameters into the formula, we have;

Simple interest = $80
Read more on simple interest here: brainly.com/question/24341207
The answer for number 4 is scooter
4x+ 3 = 3(2x-5) ;x=2; x^{2} = 4
Of course, the number is 7.
You have its square and its cube.
To find x from its square: √49 = 7
To find x from its cube: cubic root of 343 = 7
You made a mistake in the first column. The cubic root of 8000 is 20. The square of 20 is 400