You don't need me to give you all six of them, because they're
all essentially the same problem. So I'll give you two, and lead
you close to the answer of another one, and by then, you should
be able to handle them on your own.
5). y/2 > 0 .
What can you do to the left side to get 'y' all alone ?
Multiply the left side by 2 .
But you always have to do the same thing to both sides.
Multiply each side by 2: y > 0 .
_____________________________
6). -4 < r/5
What can you do to the right side to get 'r' all alone ?
Multiply the right side by 5 .
But you always have to do the same thing to both sides.
Multiply each side by 5: -20 < r
_______________________________
7). 5c < 10
What can you do to the left side to get 'c' all alone ?
Divide the left side by 5 .
But you always have to do the same thing to both sides.
Divide each side by 5: c < ____
Over to you, champ !