So lets remember the formula for interest first. #lightbulb here it is <span>A = P(1 + rt) all we really have to do is plug in our rates, principles, and time into equation. P = $800 t = 2 years r = 6.5% or as a decimal 0.065 now lets look at our new equation that finally has numbers in it
A = 800[1 +(0.065)(2)] first lets take care of the 0.065 and 2 by multiplying them together. thus our new equation. A = 800(1+ 0.13) then we add the 1 to the 0.13 and get 1.13 800(1.13) from here we just multiply and that equals 904 since we are looking for what is earned we take 904 and subtract 800 to get that answer. Here is the math.
904 - 800 = 104 he made 104 dollars in 2 years! hope this is right. have a good one:)
The equation will be of the form: where A is the amount after t hours, and r is the decay constant. To find the value of r, we plug the given values into the equation, giving: Rearranging and taking natural logs of both sides, we get: The required model is:
