What is the principal square root of 16?
A
-4
B 4
С
1/4
D
-1/4

4

Step-by-step explanation:

The principal square root is the positive square root

sqrt(16) = ±4

taking the positive square root

4

mental cunning

explanation:

he is often referred to as a man of twists and turns

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°