7a + 6c + 9a - 15c
-- Look for all the 'a's 7a, 9a
-- Addum up 16a
-- Look for all the 'c's 6c, -15c
-- Addum up -9c
-- Write the results 16a - 9c
Can you explain what the question is asking?
I would say that in doing an experiment that will have multiple trials, if one of the variables is changed each time, say temperature or pressure amount, then average results between experiments will not be valid. They would only be valid if the same conditions applied for each one, to determine the inherent variability of the result.
Answer:
94
Step-by-step explanation:
Since the circle equals to 142 degrees you have to subtract the already given umber (48) by the total amount and it'll give you the missing angle which is 94.