If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
(80*x)/3600 < 0
(80*x)/3600 < 0
(80*x)/3600 < 0
1/45*x+0 < 0 // - 0
1/45*x < 0 // : 1/45
x < 0/1/45
x < 0
x in <0:+oo)
2 = ((80*x)/3600)^(1/2) // - ((80*x)/3600)^(1/2)
2-((80*x)/3600)^(1/2) = 0
-(1/45)^(1/2)*x^(1/2) = -2 // : -(1/45)^(1/2)
x^(1/2) = 2/((1/45)^(1/2))
( 2/((1/45)^(1/2)) < 0 i 1/2 in (0:1) ) => x należy do O
x belongs to the empty set
| y=8/3x-7 | | 1/8/4/5 | | h(t)=-16t^2+79+5 | | 5/7(72-5x/3) | | 0.2/.009 | | [(x-(1+2i))(x-(x-2i))](x-(-4))=0 | | (-2)^2/(-2)^2 | | 3x+1=(x+1)-2 | | 3n+4=5n | | 6/8-4/8*7/8 | | -15=-3-12 | | 3x^2+10x-5200=0 | | -15=27-12 | | 11x-30= | | 567t^2-343= | | (3x-1w)(3x+8w)= | | 3w/4=24 | | 16x-15=180 | | e^5x=e^15 | | 2x/-4-5=2 | | 3!/n!=336 | | x+(x-10)=0 | | 9a+7b+5c=28 | | 3a+6b+9c=24 | | 1/6w=120 | | X-1/x-2=5/2 | | a^(3n/3) | | 490t^2-160=0 | | 2x+3k+4=10 | | 10x=.60x | | 4a+6b=45 | | 9-7(x+6)=9(x-8) |