Simplify: √(√21 -2√7)^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

Askateboard ramp is in the shape of a right triangle what is the height of the ramp

6cm10 cma conical paper cup has dimensions as shown in the diagram. how much water can the cup hold when full?