Which of the following is equal to the rational expression when x does not equal 3 or 1 x^2-9/(x-1)(x-3) a. x-3/x-1 b. x+3/x-1 c. x-1/x-3

b.  

Step-by-step explanation:

Given expression is:

Let us factorize the numerator using the formula:

Since x ≠ 3, let us cancel the common factor x - 3 in the numerator and in the denominator.

So,

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°