91影视

In this type of question, Simply use the concept of understanding the question very carefully and then taking a variableand with accurate symbol >,< make a suitable inequality.

Here, The ski wax you use keeps your skis performing well at temperature from

$-6掳C鈥�to鈥�15掳C$.

From the above statement, it is clearly seen that the wax need a minimum temperature of $-6掳C$ and up to maximum temperature of $15掳C$. So, the lower limit will be $-6掳C$ and the upper limit will be $15掳C$.

Now, Let t be the temperature range where the skis will perform well.

Then, the inequality of the two situation are: $t鈮�-6掳\&t鈮�15掳$

On combining the both inequality, it gives: $-6掳鈮�t鈮�15掳$

Graphical Interpretation

Following is the graph of the expression $-6掳鈮�t鈮�15掳$ to get the proper graphical representation to know the points.