Question

Which expression is positive? I will send you a screenshot of that number line I am having difficulty with.

Answer 1

Given:

A number line.

To get the expression that is positive, we estimate the values of the points on the number line.

`\begin{gathered} Assume\text{ }a\approx-1.8 \\ \\ Hence, \\ -a-1=-(-1.8)-1 \\ =1.8-1 \\ =0.8 \\ \\ This\text{ gives a positive result} \end{gathered}`

Also, for the other expression,

`\begin{gathered} Assume\text{ }b\approx2.5 \\ \\ Hence, \\ -b+2=-2.5+2 \\ =-0.5 \\ \\ This\text{ gives a negative result} \end{gathered}`

Therefore, the expression that is positive is -a -1

OPTION A is correct.