X^2 - 4x - 77 = 0 Factor and check

Which graph shows a function with a range of all real numbers greater than or equal to -1

The system of equations graphed below has how many solutions? y = 2x + 2

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