Please help asap! my geometry homework doesnt make sense

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .

Solve for the equation. 4x - 13 = 2x + 9