. For a customer, the number of books he buys in a bookstore can be treated as a random variable. The probability of not buying any book, buying one book and buying 2 books are 0.05,0.8 and 0.15 for each customer. Suggest there are 400 customers who come to this bookstore today and the number of books purchased by each customer are a sequence of iid random variables. (a) Find the probability that the bookstore could sell more than 450 books (the sum of all customers buying) today

∆abc is reflected across the x-axis and translated 2 units up to give the image ∆a'b'c' with coordinates a'(1, 1), b'(2, -1), c'(2, 1). what are the coordinates of the preimage ∆abc? a. a(-1, 1), b(-2, 3), c(-2, 1) b. a(1, 1), b(2, 3), c(2, 1) c. a(1, -3), b(2, -1), c(2, -3) d. a(1, -3), b(2, -5), c(2, -3)

The graph of g(x) is a translation of y = which equation represents g(x)?

Isuck at math ; ^; m a student solved this problem and said the answer is 3 feet. chase had a roll of ribbon that contained 7 7/8  feet of ribbon. he cut off one piece that was 3 5/8  feet long and another piece that was 1 1/4  feet from the roll. how much ribbon was left on the roll? is the student's answer reasonable? yes, the answer is reasonable. no, the answer is not reasonable. it should be about 2 feet. no, the answer is not reasonable. it should be about 13 feet. no, the answer is not reasonable. it should be about 4 feet.