students make a rectangular banner that is 2 feet 6 inches wide and 84 inches long what is the perimeter

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?