Using simple interest, it is found that:
- The amount invested at 7% is $2,000.
- The amount invested at 8% is $8,000.
<h3>Simple Interest</h3>
Simple interest is used when there is a single compounding per time period.
The interest after t years in is modeled by:

In which:
- r is the interest rate, as a decimal.
In this problem:
- A total of $10,000 was invested, hence
.
- Two accounts paying 7% and 8% annual interest, respectively, hence
.
- The total interest earned for the year was $780, hence

Then:


Considering
:

Considering
:

Considering
:





And:



Then:
- The amount invested at 7% is $2,000.
- The amount invested at 8% is $8,000.
You can learn more about simple interest at brainly.com/question/25296782
Answer:
LN = 64 units
Step-by-step explanation:
I got it correct on the test
Angle 1 = 180-10= 170 degrees, and the relationship is called supplementary angles
Step-by-step explanation:
hope it helps . please give brainliest
You're original equation has a -81, so the factored form will have to have a positive and negative multiplying one another to achieve that...
f(x) = x(x + 9)(x - 9)