PLS HELP... NEED ANSWER ASAP AS I HAVE A TEST NEXT WEEK!!

Q: the total surface area of this cuboid is 112cm squared...

find the value of x

(there's a picture below)

x = 3 cm.

Step-by-step explanation:

The surface consists of 3 pairs rectangles of equal area. so we have the equation:

2* 2x + 2* 10x + 2 * 2*10 = 112

4x + 20x + 40 = 112

24x = 72

x = 72/24

x = 3 cm.

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