The length of the rectangle is described by the function y = 3x + 6, where x is the width of the rectangle. Find the domain in this situation. SOMEONE HURRY PLS

Can someone me i’m confused. will give brainliest and a whole bunch of points

Find the roots of the equation below. x^2 - 6 + 9 = 0

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.