On average, a refrigerator door is opened 38 times each day. len has two refrigerators in his house based on this ,about how many times in a 3-week period are the refrigerator doors opened?

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.

[15 points]find the quotient with the restrictions. (x^2 - 2x - 3) (x^2 + 4x + 3) ÷ (x^2 + 2x - 8) (x^2 + 6x + 8)

△def is similar to △stu. write a proportion that contains st and su.