What is the point if of origin in a number line

Find the sum to the equation 3+6+9+

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

The reflexive property of congruence lets you say that ∠pqr ≅