Pls help quickly Have school tomorrow

Mathematics

1 answer:

vovangra [49]2 years ago

8 0

A. 60mph
B. 12 customers per day
C. 2.5 meters per sec
D. 1.59$ per pound

We divide to find each unit rate.
(e.g 420/7=60)
(360/30=12)(40/16=2.5)(7.95/5=1.59)

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elixir [45]

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$& y=\frac{9000}{x} \\ & A=(x-10)(y-6) \\ & A=xy-6x-10y+60 \\ & A=x\left( \frac{9000}{x} \right)-6x-10\left( \frac{9000}{x} \right)+60 \\ & A=9060-6x-\frac{9000}{x} \\$

On taking the first order derivative of A

$A'=-6+\left( \frac{90000}{{{x}^{2}}} \right)$

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