The sum of the square of a positive number and the square of 4 more than the number is 40. what is the number?

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?

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?