X-3 over 5 subtract 2 = x* x+1 over 2

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

Graph the equation by plotting point x=2

We just started the introduction into circles and i have no idea how to do this.