if you go out to eat and your meal was $72.50 you decide to tip your waiter 15% How much do you pay in total

$83.38

Step-by-step explanation:

multiply 72.5 by 1.15: 72.5 x (100% of meal + 15% of meal)

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