HELP Which data set has a standard deviation between 1.4 and 1.6?
{1, 1, 2, 3, 3, 4, 4, 4, 4}
{1, 1, 2, 3, 3, 3, 3, 4, 5}
{1, 2, 2, 3, 3, 3, 4, 4, 5}
{1, 2, 2, 3, 3, 4, 4, 5, 6}

the answer to the expression is 83

(w – 2.5)(w + 2.5)

(–4v – 9)(–4v + 9)

step-by-step explanation:

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