Please help me! My teachers haven't taught me this yet and I'm freaking out!

Simplify the polynomial.

-3f^2+4f-3+8f^2+7f+1

A. 5f^2-11f+2
B. 11f^2+11f+2
C. 5f^2+11f-2
D. -5f^2+11f-2

Aright triangle includes one angle that measures 30º. what is the measure of the third angle? a. 30º b. 90º c. 60º d. 130º

Explain why the function is discontinuous at the given number a. (select all that apply.) f(x) = 1 x + 1 a = −1 f(−1) is undefined. lim x→−1+ f(x) and lim x→−1− f(x) exist, but are not equal. lim x→−1 f(x) does not exist. f(−1) and lim x→−1 f(x) exist, but are not equal. none of the above

Guys i really need or i have to stay late up night