Find an identity for cos (4t) in terms of cos (t).

I have used 2cos^2 (2t) - 1 but I need to rewrite that in terms of cos (2t).

You have a standard deck of 52 cards. you pick one card and then, with out putting the first card back, you pick a second card. what is the probability that both cards will be 9s?

Bronze is an alloy of copper and tin. If a certain type of bronze requires 0.3 kilogram of tin per 1.0 kilogram of copper, how much tin must be combined with 50 kilograms of copper? kilogram

The sum of three consecutive integers is - 9. what are the numbers?

A gym is considering changing its operating hours at multiple locations in a city. The gym management wants to know what percent of its 4367 members would utilize the new hours of operation, so they plan to survey 500 members.

Three angles of a quadrupedal have the following measures 60° 90° and 125° what is the measure of the missing angle

If the doctor orders 4 mg of a certain medication, and the vial states that there are 2 mg in 1 cc, how many cc's would you give to deliver 4 mg?

Mrs turnan makes some pita breads for her family's dinner. Each pita bread is cut into equal slices. Each slice is 1/4 of the pita bread. Each person in the family eats 3 slices. There are 4 people in the family. How many pita breads does Mrs.

if shawna was tosses a dime and a nickel through the air at the same time what is the probability that they will both land on heads

y = x2 - 6x - 8 Complete the square in the quadratic equation in order to write the equation in vertex form.

Bonnie earned scores of 90 and 82 on her math tests. what score must she earn on her third test to keep an average of 84 or better?