Are 2b+ b and 3b equivalent expressions?

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

What is the rate for one gallon of gasoline