An automobile company has 10 choices of body styles and 8 choices of engines. how many combinations are available?

How do you answer this question? (step by step)

With finding limits of multi variable !

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe