If a:b = 1:2 then find the value of (3a + b): (4a + 2b).​

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

What is the distance between point a and b

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.