How many cups of pure water should be mixed with 9.5 cups of a 40% acid solution to dilate it into a 4% acid solution

Find all the values of x for which the function is differentiable. f (x) = (x^3-8) / (x^2-4x-5)

The sum of a number x and 4, all divided by 3

When 64 is added to the number that is produced by doubling the number x, the result is equal to 35 times the number that 1 less than x. What is the value of x?

The bill for lunch at a restaurant was $24.50. Mr. Smith added a 20% tip. How much did he pay? 1) $19.60 2) $29.60 3) $29.40 4) $26.50

A jar contains nine blue marbles, eight yellow marbles, 11 black marbles, and 12 red marbles. Without looking, what is the probability of pulling a white marble from the jar? 1 0 3/10 9/40

How many seconds are in 10 hours

If shoppers enter a store at an average rate of r shoppers per minute and each stays in the store for average time of T minutes, the average number of shoppers in the store, N, at any one time is given by the formula N=rT.

Rx+9/5=h, Solve for the value of x

Find the final balance in an account with $660 invested at 3.5% annual simple interest for five years.

Are these expressions equivalent 20d - 16 and 4 (5d - 4)