Hello again ephraim - hope you managed to finish your puzzle. When posting questions do please take care that they are laid out clearly and of course spelt correctly.
I always favour a full stop then a gap, eg:
13a. 8 - 5 + 18 etc
rather than:
13 8 - 5 / 18 which is ambiguous (plus typo!)
Sorry to complain - can see you're a newbie so all is forgiven. Hope to hear from you again, ☺ja