Yelena needs to swim a total of 8 miles this
2 answers:
Answer:
Yelena needs to swim 3 more miles
Step-by-step explanation:
You need to solve for the variable "<em>m</em>", which represents the miles. Based on the information, Yelena swam 5 miles and she needs to swim 8. Solve:
To find the value of <em>m</em>, you need to isolate it on one side of the equation. To do this, you need to get the 8 and 5 on the same side of the equal operation. For this, you need to use reverse operations. This undoes the value from one side and does the same on the other, keeping the equation balanced. Since we have a "positive 5", we take the opposite, which would be a "negative 5". So subtract 5 from both sides of the equation:
Simplify. The 5's cancel each other out, leaving 0. 8-5 is 3:
The total miles left that Yelena needs to swim is 3 miles.
:Done
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The function that we have to study in this problem is
The domain of a function is defined as the set of all the possible values of x that the function can take.
For a square-root function, there are some limitations to the possible value of the argument in the root.
In particular, the argument of a square root must be equal or greater than zero, because the square root of a negative number is not defined.
Therefore, in this case, we have to set the following condition for the domain:
And by solving, we get
which means that the domain of this function is all real numbers equal or greater than 5.