Step-by-step explanation: First we would have to make 9 21/26 into a improper fraction, which would be 255/26. I did 9*26=234, then I did 234+21=255. So now we have 255/26 - 12/13. We now have to find a number that both can divide by, which would be 13. So, we leave 12/13 just as is, then we do 255/26 / 1/2 which would be multiplying by it’s recriprical, so 255/26 * 2/1. Which would be 255/13. Now we can subtract 255/13 - 12/13. 255 - 12 = 243, so our answer would be 243/13. 243/13 = 18 9/13. (Sorry if I am incorrect)
, you have
, the derivative is
