The missing number in the given data that has a mean of 79 is: 60.
<h3>How to Find the mean of a Data?</h3>
The mean of a data set is simply the average, that is, it is the sum of all data values divided by the number of data values.
Let x represent the missing number in the data. If the mean is 79, we would have the following:
(89 + 74 + 92 + 80 + x)/5 = 79
(335 + x)/5 = 79
335 + x = 5(79)
335 + x = 395
x = 395 - 335
x = 60
Missing number is: 60.
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The next number would be -15
Answer:

Step-by-step explanation:

<u>Expand the terms in the bracket</u>
That's

<u>Add 3y to both sides of the equation</u>

Subtract 7 from both sides by the equation

<u>Divide both sides by - 4</u>

We have the final answer as

Hope this helps you