Will give thumbs up if able to give workings in excel please. Thank you!

FC.82 The Cocoa Bean sells hot chocolate during the year. This is shown in the following table: What would the December sales forecast be if the average temperature that month was projected to be 21 ? (Display your answer to two decimal places.) What is the r-value (correlation coefficient) for this set of data? (Display your answer to two decimal places. If you get a negative number then put a minus sign before your number.)