This is the diagram to the question above.
Answer: 9x + 1
Explanation: combine like terms, and since 5x and 4x has the same variable, they can be combined.
Make x the subject means you need to solve for x
y = ax^2 solve for x
divide both side by a
y/a = ax^2/a
simplify
y/a = x^2
so
x = square root (y/a)
The sale price = 99(1 - 0.1)(1 - 0.25)(1 - 0.08) = 99 * 0.9 * 0.75 * 0.92 = $61.48
360in^3
The equation of the cone is just the cylinder equation divided by 3, so I order to get the volume of the cylinder you do the opposite: multiply by 3!
So 120 x 3 = 360 :)
