The product of three numbers is -216, but their sum is -18. I’ll give 18 points!!!!
1 answer:
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Answer:
11
Step-by-step explanation:
To find the mean of a set of numbers, we add all of the numbers together and divide the sum by the size of the set. For that first set, we have three numbers, x, y and z, so the equation for their mean would be
We can rearrange this equation by multiplying both sides by 3, getting the equivalent equation
Let's do the same thing for the second mean:
With the two equations we've obtained, we can subtract (1) from (2) to get rid of x, y, and z, leaving us with
To find the mean of a and b now, all we have to do is divide both sides of the equation by 2, and we see that