Answer:
a
Step-by-step explanation:
Answer: (+) 1/3
Step-by-step explanation: 2/3 + -1/3 is basically subtracting 1/3 from 2/3 so, 2/3 - 1/3 = 1/3.
6 millimeters
A = L × W
A ÷ L = W
42 ÷ 7 = 6