I will mark brainliest! answer quick please!
1. 11/18 + 2/9
2. 5 5/6 + 3 2/5
3. 3 1/3 + 4 1/2
4. 11/18 - 1/6
5. 5 3/4 + 2 11/12
6. 5 1/2 - 1 2/7
7. 13/15 -2/5
8. 7/10 - 1/4
9. 5 3/4 - 2 11/12
10. 4 1/2 - 3 1/3

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).

Anyone know? is appreciated! will mark brainliest if correct!

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.