Which of the following is not a polynomial identity? a. (a^2+b^2)(c^+d^2) = (ac+bd)^2 + (ad+bc)^2
b. a^2 - b^2n = (a + b)(a - b)
c. a^3 + b^3 = (a - b) (a^2 - ab + b^2)
d. a^3 + b^3 = (a - b) (a^2 + ab + b^2)

How can you tell when x and y are not directly proportional?

In the given triangle, ∠aed ∼ ∠ abc, ad = 6.9, ae = 7.2, de = 5.2, and bc = 10.2. find the measure of bd and ce. round your answer to the nearest tenth.

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.