The table below shows the outputs y for different inputs x:
input
(x) 1 1 3 3
output
(y) 4 2 12 6
part a: does the table represent y as a function of x? justify your answer.
part b: the total cost f(x), in dollars, for renting a paddleboat for x hours is shown below:
f(x) = 20 + 10x
what is the value of f(120), and what does f(120) represent?

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

$9.89

step-by-step explanation:

9.90 = p x .06 x .25 (3/12 changed to a decimal)

9.90 = p x 0.015

9.90 - 0.015 = p

9.89 = p