Probability and statistics
which of these is an example of a continuous random variable? 
a. number of heads when you flip a coin 5 times
b. number you roll on a die
c. number of boys in a class
d. height of 10-year-olds

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Plz help plz give me the answer

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?