Which step in the solution contains the first error ?? Please helpp

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.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?