The following numbers are shown on the number line:-1.8,0.8,3.1,-1.2,2 3/4. Which number is represented by point B?

Without the actual number line provided, it is not possible to determine which number is represented by point B.

To determine which number is represented by point B on the number line, we need to first identify the position of point B.

Given the following numbers on the number line: -1.8, 0.8, 3.1, -1.2, 2 3/4

Let's assign letters to represent each number:
A = -1.8
B = 0.8
C = 3.1
D = -1.2
E = 2 3/4

Now, let's arrange these letters in ascending order:
A < D < B < E < C

From this ordering, we can determine that point B falls between points A and C. Therefore, the number represented by point B is 0.8.