Using the diagram below, what is the length of AC

9514 1404 393

  B.  4 mi  (the correct answer is marked)

Step-by-step explanation:

Corresponding sides are proportional:

  AC/EC = AB/ED

  AC = EC×AB/ED = (12 ft)×(7 mi)/(21 ft) = (84/21) mi

  AC = 4 mi

There is no need to convert from miles to feet, or vice versa, in this problem. The units of ft/ft cancel, so the resulting units associated with the numerical value are miles. (If the unwanted units don't cancel the proportion is written incorrectly.)

circumference divided by 3.141592654 then timesthe radius twice

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice

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