Please give me the correct answer

Asequence is defined recursively by the formula  f(n  +  1)  =  f(n)  +  3 . the first term of the sequence is  –4. what is the next term in the sequence? –7–117

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .