Please help!!!

Given the graph below state whether or not the relation is a function, and give the domain and range.

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

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?