4 groups of 9 write the equation

9x4=? Because there are 4 groups of 9 so it is multiplication.

(9)(4)=36
You must include the 36 because equations include equal signs and answer.
This equation shows them multipling.
~JZ

R = revenue r = (12.50 + 0.5x)(1800 - 60x)r = -30x2 + 150x + 22500r = -30(x2 - 150x - 750)r = -30(x - 30)(x + 25) {-25, 30} The zeros are -25 and 30.The maximum occurs at 2.5.Since the price increases by 50 cent increments, the maximum would happen at x = 2 or x = 3The tickets can be either $13.50 or $14.00.