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This is for economics. I have the figures for goods credit and goods debit. Then services debit and services credit. I can't remember the formula, if there is one..

So I missed out a couple of weeks on maths and missed out quite a bit :uhoh: I don't understand what is this "In" thing in the questions. I only have formulas with either "log" and "x", "d", "v" signs. https://prnt.sc/hjyiz4 These questions are the ones I'm stuck on. I don't need all of them...

I attempted the first question and got like halfway but I don't know how to do find volumes of semicircles in integration. There are 2 questions I'm stuck on for the first image its on the right question b) and 16. Sorry for the bad quality

Find the shaded area is rotated around the y-axis. Find the volume of the solid formed. This is the question. I don't understand how I keep getting this wrong! I used the formulas in the pic