Suppose sin(β) = 1/9. find the exact value of sec(β) for 0 < β

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Solve 2x+y=3 x+y=5 in substitution method

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