A triangle has sides with lengths of 5 x - 7 3 x - 4 + 2x - 6 what is the perimeter of the triangle

7friends share 4 pizzas equally how much pizza did each friend get

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters .

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?