Twenty-five blue and twenty-five yellow marbles are placed in a jar. some thirty-four marbles are removed from the jar and put in a second jar. what is the positive difference between the number of blue marbles in the second jar and the number of yellow marbles remaining in the first jar? plz

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.