What principle will amount to $8000 if invested at 5% compounded quarterly for 18 years?

three-fourths of an hour

36÷48=0.75

0.75=

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 is c

step-by-step explanation:

81/12=324/x

x=48

answer is

b.

11

hope you get this one right.