D is the answer
(4+8)+1 = 13
4+(8+1) = 13
Therefore equation D is true
Answer:
Step-by-step explanation:
screen shot attached
Answer:
85 m
Step-by-step explanation:
5696/67=85
Answer:
12-9
Step-by-step explanation:
If 'x' value is 2
Then x*6 - 9
Then x*6 = 12
Then x*6-9 = 12-9
The two lines are perpendicular because both of the lines intersects