20b+91≥b+53>34+20b solve for b

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 are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

If the scale factor between two circles is 2x/5y what is the ratio of their areas?