It would take under minutes it would take seconds please forgive me if this is wrong :(
The answer is B. That is not a valid way to sample as it is not randomly selected.
The ratio of heights = ratio of the square roots of the areas because area is 2 dimensional and height is one dimensional.
so required ratio is sqrt 40pi : = sqrt40:sqrt80 = sqrt1: sqrt2 = sqrt (1/2) = 0.7071 to 4 significant figures
The solution for the x-value in this set is -7≤x
X= 5 or -8
Add all the like terms and set it equal to 49, use quadratic formula or factoring.
