**^^**
while doing a math problem in class, jared's answer was different from his teacher's. so she had him come up and work the problem on the board. here's jared's work.

36.47
x 12

7294
+ 3647

109.41

what was his mistake?

a> he multiplied incorrectly.
b> he left out the place holder under the 4.
c> there are not enough numbers after the decimal.
d> the sum of 7,294 and 3,647 is incorrect.

The other answer is wrong, actually

Step-by-step explanation:

The real answer is B, He left out the place holder under the 4.

Jared did not multiply incorrectly.

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

add the numbers under frequency to find the total number:

5 + 8 +7 + 4 + 0 +1 = 25

the answer is 25.