Find total surface area

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

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

What is the absolute value of the complex number -4-sqrt2i