Can somebody help me?

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

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.