Simple interest means the interest at the end of each year will always be 8% of 2000 (assuming he doesnt pay some of it off), and will not be compounded with the existing interest.
To get a percentage, multiply by the percentage/100, in this case i.e. multiply by 0.08.
2000*0.08 = $160.
Therefore he has $160 of interest each year to pay.
Now we just need to work out how many lots of 160 go into 640, i.e. divide through.
640/160 = 4 - therefore he has had the loan for 4 years.
So, first add 1.75 and 1.15 together. the answer? 2.9, add a zero, 2.90. then subtract 2.90 off of 5, the answer is 2.1.
-4? What is the full equation?
The domain will be x>0 because their cannot be negative people or negative cost of living per person.
