Which describes the expected value: the sum over all outcomes of the value of the outcome times the probability of the outcome the level of confidence that a sample mean accurately represents a population mean the population mean the interval around the sample mean that you expect to contain the population mean

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

(a) compute the maclaurin polynomial m2(x) for f(x) = cos x. (b) use the polynomial of part (a) to estimate cos π 12. (c) use a calculator to compute the error made using the estimate from part (b) for the value of cos π 12. remember that the error is defined to be the absolute value of the difference between the true value and the estimate.

Anyone know? is appreciated! will mark brainliest if correct!