The ratio of girls to boys who participated in the quiz bowl was 7: 5. there were 42 girls in the competition. how many boys participated?

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?

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2

How do i put 3(x+7) in distributive property