1.
what is the value of p – (–3.5) when p = 8.2?

Well set it up first. You get: 8.2-(-3.5) so what you do is that you first subtract 8.2-3.5=4.7. Then you want to find out weather it is negative or positive. First point out which one is bigger in this case 8.2 is bigger and a positive so your answer would be positive.  +8.2 or 8.2

1+1=22×1=22-1=11-1=1duh