Answer:
(8,-2)
Step-by-step explanation:
x and y switch places and x's sign is changed
Answer:
9(r + 8) = 9r +72
Step-by-step explanation:
9(r + 8)
9r + 72
Hope this helps!
Step-by-step explanation:
17000
Let the number of panels Plant B produced be x.

Answer:
48 ways
Step-by-step explanation:
Let me take a guess
S₁_₁₅ = (1+15)*7 + 8 = 120
There are 48 combinations of distinct digits from 1 to 15 to make 20
120-20=100
So every 20 has a corresponding 100
I wish I got it right, otherwise report it.