Evaluate 12x-(4y+7z) for x=9 y=4 z=2

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?

Nikolas calculated the volume of the prism. his work is shown below.