Answer:
B) measures of variability
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Answer: The primary cause of low pH in precipitation over northeastern North America is sulphuric acid (H2SO4) from industrial and urban emissions of sulphur dioxide (SO2). Nitric acid (HNO3) generated from emissions of nitrogen oxides (NOx) is a significant contributing factor in this region.
Step-by-step explanation:
Answer:
The equation
could be used to represent this situation.
Step-by-step explanation:
Given:
Azul bought 10 reams of paper at the store for a total cost of $84 the tax on the purpose was $4.
Now, to find the equation that could be used to represent this situation.
Let the cost of a ream of paper be 
Total reams of paper = 10.
The tax on the purpose = $4.
The total cost = $84.
Now, to write an equation to represent this situation:


Therefore, the equation
could be used to represent this situation.
Answer:
x=-3
Step-by-step explanation:
-x-20=4x-5
-20=5x-5
-15=5x
x=-3
We need to follow PEMDAS
So

167So... none of your answer choices are correct.