Could you check if I did properly for questions 9, 10 and 11? (they are in the attached files)
9. Add stems to each of the following to make one complete bar in each time signature...
Please see attached,
a) everything here is generally right, it's just that you need to beam them a little differently for 6/8 time. You need to beam in two groups of three eighth notes each. So there should be 6 sixteenths beamed together and then two sixteenths and two eighth notes together.
b) again, you have but the right stems on but haven't joined them correctly. The first two groups of sixteenths should be separate, four for each ...