Arectangle's width is x and its length is 2x-1. its area is 21. find its dimensions.
my work so far: 21 = x(2x +1) 21 = 2x^2 + x i was wondering how i would continue to solces this problem.

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

Explain why the function is discontinuous at the given number a. (select all that apply.) f(x) = 1 x + 1 a = −1 f(−1) is undefined. lim x→−1+ f(x) and lim x→−1− f(x) exist, but are not equal. lim x→−1 f(x) does not exist. f(−1) and lim x→−1 f(x) exist, but are not equal. none of the above

Which of the following represents the zeros of f(x) = 6x3 − 31x2 + 4x + 5? −5, one third , one half 5, − one third , one half 5, one third , − one half 5, one third , one half