On a math test, 5 out of 20 students got an a. if three students are chosen at random without
replacement, what is the probability that all three got a's?
a) 25/1368
b)3/400
c)1/114
d)none of the above

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Write an equation for the function that includes the points (2,100)and (3,100)

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.