How much 40% alcohol solution should be added to 40 litres of a 25% alcohol solution to increase it to a 30% alcohol solution?

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.

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy