A cashier at a store has five dollars in $20 bills if there are six times as many five dollar bills as $20 bills and the total mount of money is $1450 find the number of each bill

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year