The diver went down 3 feet below surface so that means negative when you see key words like went "below" or "down" surface level or something it means negative it's getting negative if you see the opposite it's positive.
In this case the diver went down 3 feet so -3 and then it says the diver went down an additional 2 feet so add and additional -2 to the -3 that would be -5 because 3 + 2= 5 it would be kind off the be same for negative
Direct proportionality 2 inches/ 10 miles = 5 inches / x miles cross multiply 2x = 50 divide both sides by 2 x = 25 The actual distance between the library and the bank is 25 miles
