Suppose the population of a certain city is 5608 thousand. It is expected to decrease to 4827 thousand in 50 years. Find the percent decrease.

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: 5

step-by-step explanation:

answer: answer is b.

[m < b = 120º]

step-by-step explanation:

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125.28

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