Given that y varies directly with x, what is the equation of direct variation if y is 16 and x is 20? y=0.6x y=4/5 x y=1 1/5 x y=5/4 x

Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

Answer for 10 points show work you guys in advanced < 3

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent