URGENT GIVING BRAINLIEST no links no scams no fake answers no guessing use evidence if you get it correct with evidence i will give you 100 points

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).

How far could you drive on 50 gallons of gas

Which number completes the inequality? 2/3 < _ < 7/9