Which is the best reason why step 1 is a good first step in the solution shown?

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?

25 ! the line of best fit is h = 5a + 86. predict the height at age 16.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)