Cos2a= 2cos^2a-1 for all values of a true or false?

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15