What’s the answers I’m confused and how do I find it

For which rational expression is -2 an excluded value of x?

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0