Can i get some help on this please

If g(x) = x+1/ x-2 and h (x) =4 - x , what is the value of ( g*h) (-3)?

When only separate discreet points are graphed it is called?

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?