statement of cash flow

Dear sir,
I am having certain problems to understand certain issues.

1. What’s the difference between interest paid and interest expense?
In the BPP revision kit there is a question where interest paid is $75. In the answer this $75 has been recorded as interest expense( in the ‘adjustment for’ section) and it has also been recorded as interest paid (tax paid less interest paid). Why so?

2. Interest received is $25 and it has been minus in the “adjustments for” section and this interest received has been also added in the ” cash flow from investing activities” .Why so?