How do you simplify the expression (y-15)5

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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?

Which is the solution to the inequality? 2 3/52 1/15 b< 3 2/15 b> 3 2/15