Formulas and Literal Equations

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Graph red beads cost $1 an ounce and gold beads cost $3 an ounce. juanita wants to purchase a 12-ounce mixture of red and gold beads that she can sell for $2 an ounce. the solution of the system shows the number of beads needed for juanita to break even. x + y = 12, x + 3y = 24 how many ounces of red beads will juanita buy to break even? how many ounces of gold beads will she buy?

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?