Question

this

Answer 1

link

Answer 2

since the top is multiplication between the n and (a1+a2) you can put the 2 below either term you want

Answer 3

if further explanation is required just ask

hope i could help

Answer 4

ya im still not understanding could u further explain @alec.mccarty

Answer 5

@SACAPUNTAS i dont get it

Answer 6

You know the distributive property, right?
\[a(b + c) = ab + ac\]

Answer 7

\[n\left(\frac{a_1+a_2}{2}\right) = n\left(\frac{a_1}{2} + \frac{a_2}{2}\right) =\]\[ n\left(\frac{1}{2}(a_1 + a_2)\right) = \frac{1}{2}n(a_1 + a_2)\]