What is the sum of the polynomials (-x^2+9)+(-3x^2-11x+4). • -4x^2-2x+4 • -4x^2-11x+13 • 2x^2+20x+4 • 2x^2+11x+5

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

What is the equation of this graphed line? enter your answer in slope-intercept form in the box.

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?