Please help me number 1

Find the equation of the line that goes through the points (4, –1) and (2, –5). use slope formula,equation,to find the slope of a line that passes through the points. m = use slope-intercept form, y = mx + b, to find the y-intercept (b) of the line. b = write the equation in slope-intercept form, y = mx + b.

What is the difference between the predicted value and the actual value

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x