If ∠ G is supplementary to ∠ H and the measure of ∠ G is 65 ° what is the measure of ∠ H ? Please help

Supplementary angles add up to = 180 degrees...so G + H = 180. To find H, subtract G from 180.
180 - 65 = 115
So angle H = 115 degrees

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats