The answer to the first one is D. The numbers are being decreased by 6. The answer to the second one is A. The numbers are being multiplied by 10.
Can us show us the problems.
Both Ants start at the origin. Which means they will move the same distance even if they are going opposite waves
This is the distributive property because you are distributing the 9 into both terms of the parenthesis.
(10 + 7) x 9 = 10(9) + 7(9)
Answer: Distributive Property
800m as 1km is 1000m so 0.8 will be 800m