Select the correct notation for the inverse of the cosine function. arccos(x)
cos^−1(x)
1/cos(x)
cos(1/x)
(cos(x))^−1

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.

Suzanne began a trip with 18 1/2 gallons of gas in the gas tank of her car if she hughes 17 3/4 gallons on the trip how many gallons does she have left once she finish the trip

If a is a nonzero real number then the reciprocal of a is