There are (x) boys and (y) girls at the camp. How many children are at the camp altogether? [Express you answer in terms of x an
1 answer:
The answer is
You just need to put the pieces together: you are given the number (although expressed through unknowns) of two subsets that, combined together, compose the whole set you're interested in.
So, if you split all the children between boys and girls, and you know how many boys and girls are at the camp, then you just need to put the boys and girls together again to get the whole number.
And numerically, "putting numbers together" means to add them, hence the answer.
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Answer:
Sample mean
Symbol:
Step-by-step explanation:
Given
Solving (a): Is it sample mean or population mean
From the question, we understand that 10 were selected from a total of 30.
And the mean of the selected 10 is 5'2"
The selected 10 is referred to as sample and the mean of the 10 is the sample mean
Solving (b): Symbol to use.
The symbol for sample mean is:
Answer:
Please specify what the three expressions are.
Step-by-step explanation:
From what I understand, you need to set the expressions equal to each other. For instance, if one is 2(x-3) and the other is 2x-6, you could write it as:
Then, by evaluating it, you would get:
by distribution over subtraction.
by the additive property of equality
Simplify.
by the reflexive axiom.
Since x will always equal itself, 2(x-3) and 2x-6 are equivalent.
Therefore, if the expressions, once set equal to each other, result in the equation x=x, or any other expression in which one quantity equals itself, the two expressions are equal.
Sorry I could not be of more help, but you did not specify what the expressions were.