What decimal is equivalent to 4/10

3(10x-y)-5(x-y^2) need this solved asap

Find the slope of a line given the following two points

For which of the following counts would a binomial probability model not be reasonable? a)the number of people in a classroom born in januaryb) the number of people in a classroom with red hair c) the number of people admitted to a hospital in a day with a particular disease d) the number of heart beats in a one-minute perio.