Please help me on this

The rows and columns of lattice points in a three-by-three square array are evenly spaced one unit apart. how many distinct triangles with at least one side of length 2 units can be drawn using three lattice points for the vertices?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

What are “like terms”? why can we only add like terms?