Hey, so I'm taking a test from k12 and I don't understand what's 36/12?

You invested $5000 between two accounts paying 4% and 9% annual interest, respectively. if the total interest earned for theyear was $350, how much was invested at each rate? $was invested at 4% andwas invested at 9%.

Find the zeros of each function. f(x) = x^2 + 5x - 6

For the inequality |c| < |d| to be true, which of the following must be true?