Anyone know what -3 √20 - √5 is. Algebra 2

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

Iknow the answer but the calculator doesn't seem to give the right one

Scarlett stopped at a campground along the appalachian trail. the campground had a 12 acre area for tents, divided into 6 equal campsites. scarlett picked one of the sections to pitch her tent. which expression would give you the size of scarlett’s campsite? (more than one answer