Elizabeth withdrew $31 at a time from her bank account and withdrew a total of $279. Fran withdrew $46 at a time from her bank
account and withdrew a total of $184. Who made the greater number of withdrawals?
withdrawals, while
_only
_made the greater number of withdrawals, because she made_
made_ _withdrawals.
a. Fran, 4, Eliz, 9
b. Eliz, 9, Fran, 4
C Fran, 9. Eliz, 4
d. Eliz, 4. Fran 9

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

you need to add a picture