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  1. ...xdy= d(x^2+xy). Integrate it. You get x^2 + xy = constant write x= r cos a, and y= r sin a. x^2= r^2 cos^2 a= r^2/2( 1+cos 2a) +r^2 cosa sin a...

    1 Answers · Science & Mathematics · 26/10/2019

  2. A = pi*r^2 dA/dr = 2*pi*r dA/dt = dA/dr * dr/dt dA/dt = 2*pi*r * 3  = 6*pi*r When r = 5, dA/dt = 30pi

    2 Answers · Science & Mathematics · 27/02/2020

  3. s + r = 15 and 275 = 25 s + 15 r ===> 275 = 10 s + 15(15) ===> s = 5 and r = 10...s = special , r = regular

    1 Answers · Science & Mathematics · 20/08/2019

  4. V = pi * r^2 * h r = 3 V = pi * 9 * h dV/dt = pi * 9 * dh/dt The depth doesn't matter dh/dt = 0.5 dV/dt = 9 * pi * 0.5 = 4.5 * pi Your calculator can do the rest.

    2 Answers · Science & Mathematics · 29/05/2020

  5. Area circle pi r 2 pi x (13 x 13) = 531 ft2 pi x (10 x 10) = 314 ft2 Sidewalk area is first total minus second total = 217 ft2 Diameter fence = 2 pi r = 2 x 3.1415 x 13 = 81.7 ft

    5 Answers · Science & Mathematics · 10/08/2019

  6. ...the equation of the line that goes through the following points: R(-5,8) slope= undefined. 1. Slope-int form (y=mx+b) 2. and Standard...

    2 Answers · Science & Mathematics · 11/09/2019

  7. ...distance from (h , k) to C and C' is c (x - h)^2 + (y - k)^2 = r^2 (0 - h)^2 + (0 - k)^2 = a^2 = (9 - h)^2 + (9 - k)^2 (3 - h)^2 + (0 - k)^2 = b^2...

    2 Answers · Science & Mathematics · 18/08/2019

  8. Second answer: V = πr^2h + (4/3)πr^3 h = r V = πr^3 + (4/3)πr^3 V = (7/3)πr^3 3V/(7π) = r^3 r = cube root (3V / 7π)

    2 Answers · Science & Mathematics · 25/08/2019

  9. Presuming monthly interest, this is the loan payment equation: P = r(PV) / [1 - (1 + r)^(-n)] Where: P = monthly payment PV...

    1 Answers · Science & Mathematics · 17/09/2019

  10. Convert to rectangular coordinates: r = √(x²+y²) x = r cosΘ y = r sinΘ r = 3/(1-3cos...

    2 Answers · Science & Mathematics · 02/07/2019

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