Question

The price-demand function is p(x)=49.5−0.08xp(x)=49.5-0.08x. That is, p(x) is the price in dollars at which x knobs can be sold.

How many knobs can be sold at a price of $33.90$33.90?
Write an equation for the revenue function R(x)R(x).

Answer 1

Plug in 33.90 as x
33.90 = 49.5-0.08x
Now solve
-15.6=-0.08x
x=195

Answer 2

Thank you, im so blind when it comes to these problems