question: a 15-minute walk through the westerpark will get you to the heart of the city.
Capitalize this past sentence correctly.
A: A 15-minute walk through the Westerpark will get you to the heart of the city.

question: before you can open a weap file, you'll need to figure out what kind of file the weap file extension refers to.
Capitalize this past sentence correctly.
A: Before you can open a WEAP file, you'll need to figure out what kind of file the WEAP file extension refers to.

question: it will still be better, a use solution a for using the solution b.
Capitalize this past sentence correctly.
A: It will still be better, a use solution A for using the solution B.