one third of a student class is absent today. one half of those were also absent yesterday. about wayt percent of the class has been absent for two straight days?

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

he earned 78.75 in interest.

step-by-step explanation:

yeah i know the problem you need. i am taking it right now. the answer is step 3

~mickey