Let A = {a,b,c, d}. Find P(A).

I was doing my homework but look for an example but I don't know how they get the class midpoint

Please reflect on which aspects of the topics you best & worse understood. Also describe how the topics in EACH part apply (or do not apply) to an application of your choice. Maybe a short paper, essay, etcTo be clear, the format can be like:1) Describe what topics were your strengths. Explain2) Describe what topics were your weakest. Explain3) Find an area (science/ engineering/ math/ etc...) of your interest where these topics may apply. Explain how they apply or do not apply

You are designing a poster which has a border around the printed portion. The border is 2 inches wide on the left and right sides, and 3 inches wide on the top and bottom. The entire poster will be a total of 300 square inches, including the borders and printed portion combined.