- Organic Chem help I cant figure out why this is wrong?

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Functions problem plus an explanation with the answer would really help so i know how to solve the next one? What is the elements of H=[x/x is a counting number between 7 and 10]? What are the best 3D softweres for wood cnc? Did the original base of all animals mutate down to all the other sub-species or evolve up to all the other sub-species? Write each as a single mixed number (with the fraction being proper): a) 2 5/84 + 5 27/28
b) 1 3/5 − 4 2/3
c) 2 1/2 × 1/2
d) 3 9/17 ÷ 3/17?