Is 6.825 rational or irrational

You are on a cycling trip around europe with friends. you check the weather forecast for the first week. these are the temperatures for the week. sun mon tues wed thurs fri sat 16°c 20°c 24°c 28°c 28°c 23°c 15°c what is the mean temperature forecast for the week?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

What would the rule be for the reflection of y=-3