What expression can be used to add 7/10 + 13/20

Use the x-intercept method to find all real solutions of the equation. -9x^3-7x^2-96x+36=3x^3+x^2-3x+8

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show