Which of the given pairs of expressions are equivalent? select all that apply.
a. 3z + 2z and 5z
b. (8x – 8x) – y and 0
c. 9.1 + 4.5a – 2.5a and 11.1a
d. -7y(3) – 3 and 0
e. y – 6(3) and y – 18

Carli has 90 apps on her phone. braylen has half the amount of apps as theiss. if carli has three timesthe amount of apps as theiss,how many apps does braylen have? let b represent the number of braylen's apps and t represent the number of theiss's apps.