A person invested $7,400 in an account growing at a rate allowing the money to double every 13 years. How much money would be in the account after 11 years, to the
nearest dollar?

the answer is c.

step-by-step explanation:

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

answer: 0.26

i used the calculator on google

i think this is a open ended question but i agree with other guy who said you should ask it at english section