Hello DemonX01For number (1), you're right: your working is not correct.

However, I don't know what method you are supposed to use to solve these equations. The only way I can see is to use some sort of approximate numerical method. Doing this, I can tell you that the answers are: (1) 1.9311, and (2) 0.6758, correct to 4 d.p.

But I cheated a bit and used a spreadsheet.

Grandad