Can someone pls help with this question :)

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

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?