A radiator containing a mixture of water and antifreeze was found to have 30% antifreeze. What percent of water must be evaporated so that the radiator will then contain 35% antifreeze? Round your answer to the nearest tenth.

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?