Five pings and five pongs are worth the same as two pongs and eleven pings. How many pings is a pong worth?
pings​

Which value of c would make he following expression completely factored? 8x+cy

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

Measures of the angle of r, 31 s (x+4) t (3x+9)