A village C is 12km upriver from a village D. It takes 20mins to go from D to C and back to D by boat. If the boat travels at 6 km per hr upriver and (6+y)km per hr downriver, what is the value of y?

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the