There are 50 marbles in a jar. Twenty of the marbles are red and the rest are blue. Suppose that you randomly select 4 marbles. What is the probability that all 4 marbles selected are red?
0.211
0.08
0.125
0.021
0.015

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

Fa bus driver leaves her first stop by 7: 00 a.m., her route will take less than 37 minutes. if she leaves after 7: 00 a.m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?