Keshad gets paid $2,115 per month plus 6% of his sales. His brother earns $3,157 per month. For what amount of total sales will Keshad's monthly pay be higher than his brother's monthly pay? (Your answer should be accurate to 2 decimal places.)

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

step-by-step explanation: 2

c-   36

taxicab circle radius 9 has 4(9) = 36 points

the answer is d

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