Explain what 25 divided by 0.2 means

Which letters from the table represent like terms? a and b b and c a and d b and d

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent and the median? 40 25 8 36 18 15 24 27 43 9 12 19 22 34 31 20 26 19 17 28

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.