Answer:
second one
Step-by-step explanation:
Answer: -2x + 12
Step-by-step explanation:
2A + B = 2(-2x + 8) + (2x - 4) = -4x + 16 + 2x - 4 = -2x + 12
Answer:

Step-by-step explanation:

For positive rate of change 

Answer:
Z = 2.76
Step-by-step explanation:
Firstly you must realise that Z - 2.3 = 0.46
Therfore this means you must 2.3 to 0.46 to get Z
2.3+0.46+2.76