solve these equations
3x-2y=120
17y-5z=720
11z-5y=240
6*4-5*3+7*2
if a+b+5=0 then whats the value of a^3+b^3-15ab+125
f(x)=x^2-4x-5
g(x)=x-5
-50+6*6+7+18
365=2\pi (6400000+x)\sqrt((((6400000+x))/(9.8*64*64*100000)))
d/dx $\sqrt{\Box}$ 12 $a_{b}$x
$\sqrt{2x}$ ×x
y=sinu,u=v2,v=3x,find dy/dx
y= e^cosx^2