Help please and thank you

I can do a few of them for u. THIS IS JUST SIMPLE MATH

1. Product is the answer to a multiplication problem 85×9

2. 85-41

3. 27×3

4. 684+820

Should I do more?

You will have to figure the answer's

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