40 points :) What are the coordinates of the vertex of the function f(x)=x2+10x−3? (–5, –28) (–5, 28) (5, –28) (5, 28)

Noel is hoping to make a profit (in $) on the school play and has determined the function describing the profit to be f(t) = 8t – 2654, where t is the number of tickets sold. what does the number 8 tell you?