Suppose that a cell phone manufacturer claims that, on average, its cell phones last 7 years. If its cell phones do, in fact, last an average of 7 years,
what would be the expected mean amount of time a sample of the company's
cell phones would last?
A. 2 years
B. 9 years
Ο Ο
C. 7 years
0
D. 3.5 years

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

the answer is a beach is the best place to be

18.8cm hope i at all

step-by-step explanation: