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Natural gas usage

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Oil usage = 6.66 barrels       Coal usage = 3.39 tons       Natural gas usage = 22.10 tcf

  1. There are approximately 315 million people living in the U.S.  If every one of them used as much fossil fuel for these processes, how much usage would we have in the U.S. per day and per year? 

Oil usage/day  ____________                        Oil usage/year ____________

Coal usage/day ___________                         Coal usage/year ___________

Natural gas usage/day ___________              Natural gas usage/year ___________

 
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r differential equation

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Second order differential equation.
I want to convert this second order diff equ to a set of two first order.
d^2thata/dt^2 +(g/L)sin(theta) = 0, theta(0)=pi/6, theta'(0)=0
g = 32.17 ft./sec^2, L=2ft
Something like this:
u1(t) = theta(t)
u2(t) = theta'(t)
u1′(t) = u2(t)
u2′(t) = -16.085*sin(t) ??? not right

 
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TRIGONOMETRIC FUNCTIONS

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I have a question on TRIGONOMETRIC FUNCTIONS. “This question is only for tutor Expert_Sumit, i will not accept answer from other tutor or i will flag moderator if other tutor accepts it”.

 
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perpendicular

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Explain in words how to write an equation that is part one: parallel and then also part two: perpendicular to the equation y=2/3x-4 passing through the point (-2,-5). Write your answer in standard form

 
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