(Solved):
2. Identify the type of vertical curve (sag or crest) by the following grade for \( \mathbf{g}_{1} ...
2. Identify the type of vertical curve (sag or crest) by the following grade for \( \mathbf{g}_{1} \). (a) \( -2.3 \% \) (b) \( +4.3 \% \) (c) \( -0.5 \% \)