Pls help me im stuck on #3 and #4 will give brainliest if answer both

The length of triangle base is 26. a line, which is parallel to the base divides the triangle into two equal area parts. find the length of the segment between triangle legs.

Use pascal's triangle to find the missing values. x4 - 4xb + 6x2 - ax + 1

For the functions f(x) = -922 – 2x and g(x) = -32? + 6x – 9, find (f - g)(x) and (f - ).