5) x=-4
6)p=8
7) x=40
8) a=5
9) b=16
10) q=2
If the temperature drops, then you must have subtract amount of drop from initial temperature.

The correct answer is the first one.
ABC = XYZ by SAS
AB = XY - Side
A = X - Angle
So you want to find another congruent <em>side</em>.
Removing the taken possible side, two sides can be congruent.
Either :
BC = YZ
<em>OR</em>
AC = XZ
If all 22 tables had 6 people, there would be 132 people seated. There are 13 more than that, so 13 tables have 7 people.