Abag contains only black marbles and white marbles . ezra reached into the bag without looking , got 30 marbles , and found that 12 of the marbles were black . ezra is going to reach in the bag again and get one more marble .
what is the experimental probability that the marble will be black ?
a) 1/12
b) 2/5
c) 1/2
d) 2/3

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

Afurniture manufacturer produces chairs and sofas. each chair requires 10 yards of fabric, and each sofa requires 20 yards of fabric. the manufacturer has 300 yards of fabric available. to fulfill orders, the number of sofas must be at least twice the number of chairs. let x be the number of chairs and y the number of sofas. which inequalities are described in the problem? check all of the boxes that apply

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?