When would you use a drawing of comparison bars for a word problem

If 1 is divided by the sum of y& 4. the result is equal to 3 divided by 4 .find the value of m?

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

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?