For # four Draw something like this <
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The sample mean is an estimate of the population mean.
The sample mean is exactly equal to the population mean
<h3>How to determine the true statement</h3>
When the population mean is known; the value of the population mean can be used as the sample mean.
This is so because:
The sample mean is an estimate of the population mean.
And it is represented as:

Hence, the true statement is that the sample mean is exactly equal to the population mean
Read more about sample mean at:
brainly.com/question/12892403
Answer:
56
Step-by-step explanation:
A negative times a negative makes a positive, so:

No solutions. The equation would be
-15x-3(5x-1)=3
-15x-15x-3=3
No Solution
Hope this helped?