Answer:
Associative property of addition
Step-by-step explanation:
its the same order only the () move
Hello there, today you gave us the problem ,
Our first step is to give them common denominators, which is , solve it and we get as our answer, which can be simplified down to
AB=2r
BC=7
AC=AB+BC
-5=2r+7
-12=2r
-6=r
AB=-12
78
(-5)•(-5) + 3•21= 25+ 63= 78
1. y= 2x-5
2. y= x+3
3. y=2x+7