Insert three arithmetic means between 25 and 9

21, 17, 13

Step-by-step explanation:

Find the mean of the 2 given values

mean = = = 17

Noe find the mean of 25 and 17 and 17 and 9

mean = = = 21 and

mean = = = 13

Thus the 3 means are 21, 17 and 13, that is

25, 21, 17, 13, 9

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°