At the beginning of the week the balance in your bank account was $298.72. during the week you made a deposit of $425.69. you also made purchases of $29.72, $135.47, and $208.28. when you checked your balance, you saw that the bank deducted a $5.00 service charge from your account. how much is left in your account at the end of the week?

step-by-step explanation:

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step-by-step explanation:

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