Grace was given the description "three less than the quotient of a number squared and nine, increased by eight" and was asked to evaluate it when n = 6. Her work is shown below. Step 1: step 2: step 3: step 4: step 5: 7 in which step did she make an error?.

Raul has one solution that is 20% acid by volume and one solution that is 50% acid by volume. he plans to mix together some of each solution to create 30 milliliters of a solution that is 40% acid by volume. how many milliliters of the 20% acid solution should raul use to create the 40% acid solution? can someone explain this to me? i know that the answer is 10 milliliters, but i don't know how to get it.