Answer:

Step-by-step explanation:

Group similar terms together:

Add the term
:

Subtract the term a:

Answer: 
Step-by-step explanation:
According to the given information, we have
Sample size : n= 50


Since population standard deviation is unknown, so we use t-test.
Critical value for 95 percent confidence interval :

Confidence interval : 

Required 95% confidence interval : 
Answer:
If each charity has received $375 and there is 4 charities, the equation should look like this...
$375 x 4 = d
If you are looking how much was donated all together, the answer is:
$1500 dollars in total was donated.
Is that the exact question? because the last part doesn't really make sense to me
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Answer: A. 1
Step-by-step explanation:
sorry if im wrong