Write as numbers. 1. three thousand four hundred ninety-nine

2. one hundred eleven and 32/100 dollars

3. two hundred six and eighty-eight thousandths​

1. 3,499

2. 111.32

3. 206,088

the answer is ! ?

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