Michael has a collection of baseball and foot cards in a box. The ratio of baseball to football cards for his collection is 3:4. If he has 60 baseball cards, how many football cards does he have?

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

The wheels of a bicycle have a diameter of 70cm. how many meters will the bicycle travel if each wheel makes 50 revolutions

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.