Step-by-step explanation:
Let x be the length of segment AB.
Then the length of segment BC is (2x - 4).
The length of segment AC is x.
We know that x + (2x - 4) + x = 52.
Therefore 4x - 4 = 52, 4x = 56, x = 14.
Hence the length of segment AB is 14.
Steps: 8.3(3) + 7.9(4) = 31.6
Answer:
67
64 - 9 = 55 \sqrt{55} = 7.4161984871
7.4161984871/2 ≈3.7
21 because there is a 1/4 chance and there are 84 questions, so 1/4 (25%) of 84 is 21.