an architect notices that the scale on a blueprint he is using has been torn off. however, he sees that a 21.6-foot wall that has been built is 6 inches long on the blueprint. what is the scale for this blueprint?

a. 1 in. : 3.6 ft.
b. 1 in. : 6.3 ft.
c. 1 in. : 36 ft.
d. 1 in. : 63 ft.

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