Can someone tell me what this is really quick

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Organic apples are on special for $1.50 per pound. does total cost vary inversely or directly with the number of pounds purchased? find the cost of 3.4 pounds of apples. a. inversely: $5.10 b. directly; $5.10 c. inversely: $2.27 d. directly; $2.27