1400 dollars is placed in an account with an annual interest rate of 7.75%. To the nearest tenth of a year, how long will it take for the account value to reach 6400 dollars?

Step-by-step explanation:

see a nintendo is a very insteresting console and the nintendo 64 is a very hard consele to get your hands on

168

step-by-step explanation:

i am pretty sure that the answer is 168

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4