Help ASAP!!

What is the value of f(-4) for the function

Ihonestly have no clue if it's each or none.

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?