Determine which of the lines, if any, are parallel or perpendicular. Explain. Line a: y=6x – 2
Line b: 6y = -x
Line c: y + 6x = 1

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).

What can you determine about the solutions of this system

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?