everything is totally correct except question 1b
remember the SOH CAH TOA rule
opposite = the side opposite to the angle you’re trying to fine
adjacent = the side below the angle you’re trying to find
hypotenuse = the slanted sides
when moving any of the trigonometric functions to the other side, they’ll become inverse.
another thing is, when trying to find different angles with the given side values, the sides opposite and adjacent to that missing angle WILL CHANGE.