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...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

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 = 30pi2 Answers · Science & Mathematics · 27/02/2020

s +

**r**= 15 and 275 = 25 s + 15**r**===> 275 = 10 s + 15(15) ===> s = 5 and**r**= 10...s = special ,**r**= regular1 Answers · Science & Mathematics · 20/08/2019

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

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 ft5 Answers · Science & Mathematics · 10/08/2019

...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

...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

Second answer: V = π

**r**^2h + (4/3)π**r**^3 h =**r**V = π**r**^3 + (4/3)π**r**^3 V = (7/3)π**r**^3 3V/(7π) =**r**^3**r**= cube root (3V / 7π)2 Answers · Science & Mathematics · 25/08/2019

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

Convert to rectangular coordinates:

**r**= √(x²+y²) x =**r**cosΘ y =**r**sinΘ**r**= 3/(1-3cos...2 Answers · Science & Mathematics · 02/07/2019