HELP ME PLEASE (pre algebra)

Peaches cost $4.29 per pound. find the cost of two and a quarter pounds of peaches.

The table represents a function. what is f(-2)? a.-3 b. -1 c.1 d.3

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.