Is y in y + 2z + 45 + 5x a constant?

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

Simplify -4z+2y-y+-18z a.-22z+y b.-14z+2 c.3y+22z d.y +14z