If you change the sign of a point’s y-coordinate, how will the location of the point change

It will reflect across the x axis

Why not experiment?  Plot the point (2,7),  Then change the y-coordinate's sign:  (2,-7).  Plot this new point.  How did the location of (2.7) change when you changed the sign of the y-coordinate (7)?

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.