If a circle has a diameter of 26 units, what is its circumference? (Use pie for )

What values of c and d make the equation true?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

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.