The daily cost of producing x high performance wheels for racing is given by the following function, where no more than 100 wheels can be produced each day. What production level will give the lowest average cost per wheel? What is the minimum average cost?
C(x)=0.03x^3-4.5x^2+171x; (0,100]

The production of wheel per day is 74 which gives lowest average cost per wheel.

The minimum average cost is $168.72.

Step-by-step explanation:

Given function of average cost is

Differentiating with respect to x

C'(x)= 0.09 x² -9.0 x+171

Again differentiating with respect to x

C''(x) = 0.18 x -9.0

To find the minimum average cost, first we have to set C'=0.

The function's slope is zero at x=a, and the second derivative at x=a is

Now ,

C'=0

⇒ 0.09 x² -9.0 x+171=0

⇒x = 74.49, 25.50

Therefore at x= 74.49≈ 74, the average cost is minimum.

The production of wheel per day is 74 which gives lowest average cost per wheel.

The minimum average cost

                                                      =168.72

[Assume the average cost is in dollar]

The minimum average cost is $168.72.

answer: 25.4 units

step-by-step explanation: radius = 12.7 units

diameter = twice the radius

diameter = 12.7 x 2

= 25.4

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.