Differentiate with product rule

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Which statements regarding the diagram are true? check all that apply.

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?

What is not true about kl and mn? what is mn? (show your work)