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-0.5 degrees Celsius

Step-by-step explanation:

Since the top of the mountain's temp change was -2.5, simple multiply by 1/5 or divide by 5 to get -0.5 and your lower mountain's change of temperature.

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°

3/5

step-by-step explanation:

double number line is not a standard concept, so it must have been defined in your textbook. assume top line is numerator.