If the temperature drops, then you must have subtract amount of drop from initial temperature.

The correct answer is the first one.
Answer:
Step-by-step explanation:
There's no answer here. Because -6<21.
The time when the two trains reach each other is 1.25 hours
The trains are 68.75 away from the city when they reach each other.
Answer:
A scatter plot (aka scatter chart, scatter graph) uses dots to represent values for two different numeric variables. The position of each dot on the horizontal and vertical axis indicates values for an individual data point