Pls help, it’s timed

Which answer is it for it to be simplified completely?

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

5.(04.07) two different plants grow each year at different rates, which are represented by the functions f(x) = 4* and g(x) = 5x + 2. what is the first year the f(x) height is greater than the g(x) height? year 3 year 0 year 2 year 1