Graph three points on the number line:

Question

a point at -2(1)/(4)

a point at the opposite of -2(1)/(4)

and a point at the sum of -2(1)/(4) and its opposite.

Answer 1

-2(1)/(4) = -0.5

Opposite of -2(1)/(4) = 0.5

Sum of -2(1)/(4) and its opposite = -0.5 + 0.5 = 0

So, the three points on the number line are: -0.5, 0.5, and 0.