When adding fractions with unlike denominators, we must find an LCD (or LCM). The first term needs to be converted to a fraction (9/2). Now you have (9/2 + 3/4 + 20/1)c. The LCD is 4. Build all fractions up to 4, so (18/4 + 3/4 + 80/4)c. Now you add them all together 101/4 c.
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