You need to include the question not just the explanation.
Answer:
D. 0.343
Step-by-step explanation:
You can see the first three options as 0.340 so if you substract this number with 0.343 the remainder is positive 3.
This strategy also can be applied to the number 0.3409 but in this occasion the result is different:

That is small number but still is positive that's meaning that between 0.343 and 0.3409 the greatest value is 0.343 .
Answer:
9
Step-by-step explanation:
multiply the numbers on the top and left, like 6x3=18 units. however, since its half of 18 units, it will be 9
Answer:
161.91
Step-by-step explanation:
First find the side length or YT by using the pythagorean theorem.
c= 129.2^2 = 16692.64
b= 68^2=4624
c-b = 12068.64
The square root of 12068.64 is approximately 109.86.
Using that length use the pythagorean theorem again and so:
a = 109.86^2 = 12068.64
c = 57^2 = 3249
a-c = 8819.64
The square root of 8819.64 is approximately 93.91.
So, 68 + 93.91 = 161.91
The way I calculated it shows the answe would be a