Systems of equations solve using substitution -x-3y=4, 2x=16

What is the product of the radical expression. (7-2square root) (8+2 square root)

What is this inequality notation? t is less then or equal to 2

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.