Answer:
B.) 2 3/4 + (-4 1/4) = -1 2/4
Step-by-step explanation:
blue line: forward with positive +
red line: backward with negative -
so the number line follows:
+ -
= -1 2/4

means there exists an integer

such that

. We can divide both sides by

because

. This implies

for some integer, which is identically

.