Answer:
Following are the responses to the given question:
Step-by-step explanation:
Mean Absolute Deviation MAD
Mean squared error
linear trend equation is 

Naive method

Please find the attached file.
The answer I think is 2. 150/7 is 21 R 3. 296/7 is 42 R 2.
The answer is 5.19615242271 but if you round it to the nearest dp its 5.2
Answer:
y = 65°
Step-by-step explanation:
z = 70° (corresponding angels are equal)
y + z = 135° (exterior angle theorem of a triangle)
y + 70 = 135 (substitution)
Subtract 70 from each side
y + 70 - 70 = 135 - 70
y = 65
The greatest common factor is 1