Which is a factor of 2x2 + 8x − 90?
x + 2
x − 15
x + 9
x − 4

Find the value of the cosine for angle a

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.

Two lines parallel to the same plane are parallel to eachother