The school student council sponsor a switch day where students were able to switch classes every 20 minutes the students are in school for seven hours if a student switches as often as possible how many classrooms in all did that student visit

true statements:

a) x + y = y + x   ⇒ commutative property of addition

b) (x * y) * z = x * (y * z) ⇒ associative property of multiplication

d) (x + y) + z = x + (y + z) ⇒ associative property of addition

false statements:

c) x - y = y - x   should be: x - y = - y + x

e) (x - y) - z = x - (y - z) should be: (x - y) - z = x - (y + z)

step-by-step explanation:

1e+27

step-by-step explanation:

answer: it's d

step-by-step explanation:

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17