Modern medical advances might mean people could live 200 years. In 2009, the life expectancy is about 80 years. Assume that, due to modern advances, life expectancy gains 5.8 years every decade. From 2009, in how many years would humanity achieve a life expectancy of 130 years?

1,589.63 in.^3

step-by-step explanation:

i hope this you : d

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 (b.

164 ft2)

a base  

18

b base  

7

h height  

8