Round two of giving people free Brainiest for ranks

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

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

(c) a vine called the mile-a-minute weed is known for growing at a very fast rate. it can grow up to 0.5 ft per day. how fast in inches per hour can the mile-a-minute weed grow up to? show your work using the correct conversion factors.