I'm not sure about all of the questions, but I'll help with what I can.
1. 93 + 96 - (-5) + 92 = 286
93 + 96 = 189
189 - (-5) = 194
194 + 92 = 286
2. 3/4 + 5/6 = 1 7/12
Common denominator: 12
9/12 + 10/12 = 19/12
Simplify: 1 7/12
3. (-9)(3)(-5) = 135
-9 × 3 = -27
-27 × -5 = 135
4. 24/((-4) + 2) × 2 = -6
(-4) + 2 = -2
-2 × 2 = -4
24/-4 = -6
5. z - y + x - IyI (I couldn't find the actual mathematical symbol, so I just used two lowercase L's) use x = 9, y = -6, z = -5
-5 - -6 - l-6l
1 - 6 = -5
z - y + x - IyI = -5
6. -13 + n = -33
-13 + 13 + n = -33 + 13
n = -20
Not sure about 7
8. lv + 7l = 12
lv + 7 - 7l = 12 - 7
lvl = 5
Not sure about the rest
Hope I was able to help!