Here is my question answer and give a good explanation: which expression cannot be used to calculate the total amount paid for a meal (m) including a 15% tip?
a. m+0.15m
b. m+1.15m
c. m+3/20m
d. 1.15m

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: