Don't spam and answer please.

Chemistry balance then what type of reaction are they i don't know why it keeps saying math when i put chem

What is the solution of log2  (3x  -  7)  =  3? 4 5

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