Answer:
13
Step-by-step explanation:
The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count.
x = number
the equation to use is: 3x+4=28
3x+4=28
3x=24
x-24/3 =8
x=8
What does part a mean i dont understand
ᴀɴsᴡᴇʀ:
<u>1.Example, x²-25 can be factored as (x+5)(x-5).</u>
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</u>
<u>2.This method is based on the pattern (a+b)(a-b)=a²-b², which can be verified by expanding the parentheses in (a+b)(a-b).</u>
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</u>
<u>3.When an expression can be viewed as the difference of two perfect squares, i.e. a²-b², then we can factor it as (a+b)(a-b). For example, x²-25 can be factored as (x+5)(x-5).</u>
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