How many different "words" can be made using the letters a, band c, if you can use each letter only once? (A "word" is any combination of the letters. Note that a single letter is also considered to be a "word".)

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?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Precalculus question, image attached.