A boat traveled 30 miles upstream on a river in 6 hours. The return trip took the boat 3 hours. What was the rate of the river current, in miles per hour? I will give Brainlist and 50 points

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?