$8,000 was invested at a simple interest rate. in 9 years, the account was worth $13,040. what was the interest rate?

.63% interest

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.