2 1/5 x 1 3/4
show all work step by step

3.85 or 77/20

Step-by-step explanation:

2 1/5 -> 11/5

1 3/4 -> 7/4

find common denominator

44/20

35/20

multiply

1540/400

simplify(by a factor of 20)

77/20

77/20=3.85

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204