Pls help

Find the surface area of the composite figure.

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

What is the 12th term of b(n)=-4-2(n-1)

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*