Factor the expression below. 4x² - 1
A. (x - 1)(4x - 1)
B. (2xE 1)(2x + 1)
C. (x - 1)(4x + 1)
D. (2x - 1)(2x - 1).

If x=-3 is the only x-intercept of the graph of a quadratic equation, which statement best discribes the discriminant of the equation?

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population, find the population standard deviation, o.79828588912497

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?