Which summation formula represents the series below? 12 - 24 + 48 - 96
3
Σ-2”12)
η 0
3
Σ-2) (12)
η 0
ο Ση?(12)
4
Σ12)(-2n)
η 0

answer: my brother can figure it out, imma go get him so i can answer : ) edit: my brother is sleeping, sorry man

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

55 degrees because 55+55=110 degrees

w< 4

step-by-step explanation: