You randomly select 2 marbles from a mug containing 5 blue marbles, 4 red marbles, and 3 white marbles. How many times greater is the probability of selecting 2 blue marbles when you replace the first marble before selecting the second marble than when you do not replace the first marble before selecting the second marble? Express your answer as a fraction.

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

One positive number is 9 more than twice another. if their product is 95, find the numbers

Isuck at math ; ^; m a student solved this problem and said the answer is 3 feet. chase had a roll of ribbon that contained 7 7/8  feet of ribbon. he cut off one piece that was 3 5/8  feet long and another piece that was 1 1/4  feet from the roll. how much ribbon was left on the roll? is the student's answer reasonable? yes, the answer is reasonable. no, the answer is not reasonable. it should be about 2 feet. no, the answer is not reasonable. it should be about 13 feet. no, the answer is not reasonable. it should be about 4 feet.