Approximate 84 thank you

9.2

Step-by-step explanation:

Using a calculator, we see that √84 ≈ 9.16515 which rounds to 9.2.

If you don't want to use this method, you can see that 9 = √81 and 10 = √100. Since 81 < 84 < 100, we know that 9 < √84 < 10. Because 84 is closer to 81 than it is to 100, we can start by squaring 9.1, which is 82.81. 9.2² = 84.64 so the answer is 9.2.

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°

2y+y=5

add 2y and y