Which is equivalent to (9y2 – 4x)(9y2 + 4x), and what type of special product is it? 81y4 – 16x2, a perfect square trinomial 81y4 – 16x2, the difference of squares 81y4 – 72xy2 – 16x2, a perfect square trinomial 81y4 – 72xy2 – 16x216, the difference of squares

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

What statement is true? 2x^2-9x+2=-1

If you are dealt 4 cards from a shuffled deck of 52? cards, find the probability that all 4 cards are diamondsdiamonds.