Answer:
The formating is a bit confusing but I think the answer to your question would be, "Matt's error is that he just divided the denominator and not the numerator "
Answer: Regression line equation: 
Step-by-step explanation:
Equation of least-squares regression line for predicting y :

, where
, 
Given: 
Then,

Now,

Then, Regression line equation: 
Answer:
12,345 tablets may be prepared from 1 kg of aspirin.
Step-by-step explanation:
The problem states that low-strength children’s/adult chewable aspirin tablets contains 81 mg of aspirin per tablet. And asks how many tablets may be prepared from 1 kg of aspirin.
Since the problem measures the weight of a tablet in kg, the first step is the conversion of 81mg to kg.
Each kg has 1,000,000mg. So
1kg - 1,000,000mg
xkg - 81mg.
1,000,000x = 81

x = 0.000081kg
Each tablet generally contains 0.000081kg of aspirin. How many such tablets may be prepared from 1 kg of aspirin?
1 tablet - 0.000081kg
x tablets - 1kg
0.000081x = 1

x = 12,345 tablets
12,345 tablets may be prepared from 1 kg of aspirin.
500=2.5x+200
x=the amount of desserts.
500-200=2.5x
300=2.5x
x=120
C is the answer.