ElectricPavlov

https://web2.0calc.com/questions/please-help-asap_117

This has been answered multiple times in the last few months  ....do a search for it for the methodology and answers...

https://web2.0calc.com/questions/ok-i-still-need-help

This has been answered multiple times in the last few months  ....do a search for it for the methodology and answers....

PV = nr T       n (number of moles ) is constant     r is a gas constant 

so   PV =  k T

       PV / T = constant    

But Pressure is constant  in this scenario too     soooo    

  V/T = constant   

Originally   V/T = 1.75   (constant)

    Then what is V when T = 300 K   ?

         V / (300) = 1.75         V = (300)(1.75) = 525 Liters

****    deleted  *****

Misread the Q....   see Geno's answer below:

Something is missing from your question....can you edit it ? 

a = 3c-4    add 4 to both sides of the equation

a+4 = 3c   divide both sides by 3

(a+4) / 3 = c

c = (a+4)/3

3x+15 = y    sub that in to the circle equation

x^2   +  [(3x+15)/4]^2 = 36

x^2 + [(9x^2 +90x+225)/16 ] = 36

16x^2  + 9x^2 + 90x + 225 = 576

25x^2 + 90x - 351 = 0       Use quadratic formula to find     x  =  2.35692    and  −5.95692      (these are  9/5 +- 12 sqrt5/5 )

Now you can use these values of x to find the y values by substituting into the line equation

   THEN you can use the distance formula to calculate the length    sqrt  { (x1-x2)^2  + (y1-y2)^2 }

Is there an easier way???  Probably........

Strong work, Chris !    ouch !

1.109 x  = 277

x = 249.77   10 years ago

277 = 249.77 e^k(10)

^{k = .0103458}

400 = 249.77 e^.0103458t

     ^{yields t = 45.51 years    from the time the population was   249.77  (ten years ago)      35.51 years from population of 277 million (presently)}