Your temperature is 99 degrees during first period. By 7th period, your temperature is 102 degrees. How many degrees did your temperature change? Should you be at school.?

Given :

Temperature at first period , .

Temperature at seventh period , .

To Find :

The change in temperature .

Solution :

We know , change in temperature is given by the difference between final and initial temperature .

So ,the change in temperature is .

Now , the average body temperature of human body is and is considered a fever .

Therefore , we should not be in school and take rest .

Hence , this is the required solution .

3xy cannot be combined with the others

2x, -5x and x are like terms