Answer: $ 48
Explanation:
1) kw-h is a measure electric energy consumption.
2) The cost of electric energy is considered proportional to the number of kw-h (kilo watts - hour) consumed. Thi is:
cost------- = constant = unit cost = 0.40 $/kw-h
kw-h
3) Then, the total cost is the total number of kw-h times the unit cost. This is:
8 h × 15,000 watts × 1 kw / 1,000 watts × 0.40 $ / kw-h = $48.
That is the cost to charge the robot each night
F(x)=5x^2-70x+258
Solving by completing square methods gives us:
5x^2-70x=-258
x^2-14x=-51.6
c=(b/2a)^2
c=(-14/2)^2
c=49
x^2-14x+49=-51.6+49
(x-7)(x-7)=-2.6
(x-7)^2=-2.6
multiplying through by 5 you get:
5(x-7)^2+13=0
The answer is:
A] <span>5(x − 7)2 + 13; The minimum cost to produce the product is $13. </span>
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πr^2 = area
Half the diameter to get the radius
Substitute the values in:
area = 3.142 x (7)^2
area = 153.958 cm^2
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First you multiple 6*18=108
Then -108+36=-72
That it
Good luck
