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taylormack60
29.06.2019 •
Mathematics
If mr. harty pays 6% sales tax on a $20 shirt, what is the final price? a) $1.20 c) $21.20 b) $18.80 d) $20.06
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Ответ:
C I’m quite sure of it hope this helps
Ответ:
6/100 = 0.06 x 20 = 1.20
Ответ:
R(x) = 600x - 0.5.x²; This is a parabola, open downward (a=-0.5<0), with a maximum to be determined:
1st method: The maximum is when the derivative y' =0, let's calculate the derivative of R(x) = 600x - 0.5.x² →y' = 600 - (2*0.5)x →y' = 600 - x =0
Then x = 600 rooms (for a revenue of 180,000: just plug x value in the equation)
2nd method: the axis of symmetry is - b/2a = (- 600) /[(2)(-0.5)]
→ -b/2a = 600 ( so x = 600), to calculate y, plug x value in the equation.
And you will find 180,000, so the maximum is (600,180 000), which is the maximum in terms of rfeturn