320. There are 80 calories per 1/3 cup of granola. 1 cup is equivalent to 240. So you add 80 and you get 320. Hope o could help
You could do all of the work with the multiplying, but what I think it wants you to see is that you can divide like numbers by subtracting exponents.
so if we did that we would get 
this in turn would give us 4 x -9 x -5 = 180
24 is not a prime factor, so it cannot be the be the prime factorization of a number