Y=3.75+1.5(x-1) find the rate of change

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?

How many terms does the polynomial x^2 y^2 have

Adele is five years older than timothy. in three years, timothy will be 2/3 of adele’s age. what is adele‘s current age?