Margo drove for 3.85 hours at an average speed of 61.4 miles per hour . what is the exact distance she drove

The exact distance she drove was 236.39 miles

61.4 miles per hour  x (times)  3.85 hours  =     236.39 miles in total

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