how many terms are there given 2y + (x-z)?

3
x,y,& z

2y + (x - z)
= 2y + x - z

There are three terms: 2y, x and -z.

2y + (x - z)

Just do away with the parentheses by multiplying each term inside by 1.

2y + x - z = 3 terms.

3 terms 2y , x and z

3; 2y, x, and -x....you have to drop the parenthesis