Mrs. Beatty buys sketchbooks and puzzles. Each sketchbook costs $1 and each puzzle costs $3. Which ordered pair represents the cost of 3 sketchbooks as the

(3,9)

Step-by-step explanation:

The input (x) is the number of sketchbooks purchased, output (y) is the cost.
I see two linear equations.

y= 1x

or

y= 3x

The latter equation illustrates the cost of sketchbooks.

Step-by-step explanation:

The given polynomial has zeros:

By the complex conjugate property, is also a zero of the polynomial.

The polynomial can be written in factored form as:

We expand to get:

We expand further to get:

The last choice is correct.