What are the roots for the following quadratic equation?
(x - 9) (x + 1) = 0

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

Pls brainliest will be awarded if answer is correct

Edger needs 6 cookies and 2 brownies for every 4 plates how many cookies and brownies does he need for 10 plates