Question

Need some help on this Algebra 2 question. David invested $220 in a savings account that offers a 3% return on the investment. The value of David's investment will be at least $400 after a period of ________ years. Hint: Use the formula A = P(1 + r)t, where A is the amount after t years, P is the amount invested, r is the rate of interest, and t is the time period. Use a calculator to compute the answer, and round it off to the nearest year. (when I tried it I got 1.39 which would've rounded to just 1 year so I think I'm wrong)

Answer 1

HI!!

Answer 2

hello

Answer 3

yeah 1.39 is way way wrong

Answer 4

haha yeah I figured

Answer 5

\[220(1.03)^t=400\]

Answer 6

it says use a calculator, not logs, so lets use it

Answer 7

http://www.wolframalpha.com/input/?i=220%281.03%29%5Et%3D400
looks like about 20 years

Answer 8

oh wow I didn't even know about this website

Answer 9

thank you so much misty