Graham's average balance checking account pays simple interest of 4.2% annually, and he made $4.55 in interest last month. What was Graham's
average balance last month?
O A. $1192.50
B. $108.33
O C. $1300.00
O D. $1911.00

2+2=4

4+4=8

8+8= I dont know

you dont know

iii I dont know

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

4+4+2x

or

2x+8

step-by-step explanation: