On a number line, suppose the coordinate of A is 0, and AR=23. What are the possible coordinates of the midpoint of AR?

(23/2 , 0) or (11.5 , 0)

Step-by-step explanation:

Coordinate of A is (0,0) and length of line AR is 23 so coordinate of R is (23,0).

Formula for midpoint is:

(x1 + x2 / 2 , y1 + y2 / 2)

Plug in values:

(0 + 23 / 2 , 0 + 0 / 2)

(23/2 , 0) or (11.5 , 0)

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°