Add: (3x4 + x2 + 2) + (9x4 - x2 + x)
a. 12x8 + x + 2
b. 12x8 + x4 + x + 2
c. 27x4 - x2 + x + 2
d. 12x4 + x + 2

subtract: (3x2 - x - 5) - (x + 2)
a. 3x2 - x - 3
b. 3x2 - 2x -7
c. 3x2 - 3

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:

honestly bro aint no one got time to answer these dumb question just do it p***y

step-by-step explanation: