If you toss 10 fair coins, in how many ways can you obtain at least two tails?

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.

Solve the equation by completing the square. x^2+2x=17

(60 points) explain this in detail