Ateacher had 21 red pens. if the ratio of red pens to blue pens she owned was 3: 1, how many pens did she have total? (just need work i have all answers just lost work this is due on fri.)

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

What is the domain and range of each function 1. x (3, 5, 7, 8, 11) y ( 6, 7, 7, 9, 14) 2. x (-3, -1, 2, 5, 7) y (9, 5, 4, -5, -7)

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