PLS HELP! Which of the following triangles are acute triangles?

a) 5, 14, 20
b) 4.5, 6, 10.2
c) 8, 8, 11
d) 10, 13, 16
e) 4, 7, 9
f) 9, 12, 15

What is coefficient of the term of degree of degree 5 in the polynomial below

I'm confused on this could anyone me and show me what i need to do to solve it.

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?