An engineer designs a 65-foot cellular telephone tower. Find the angle of elevation to the top of the tower at a point on level ground 40 feet from its base. (Round your answer to one decimal place.)

the angle of elevation is  58.4°

Step-by-step explanation:

Given the data in the question and as illustrated in the image below;

let ∅ be the angle of elevation;

Opposite (AC) = 65 ft  

Adjacent (CB) = 40 ft  

we know that; from SOH CAH TOA

TOA

tan∅ = Opposite / Adjacent

so;

tan∅ = 65 / 40

tan∅ = 1.625

∅ = tan⁻¹ ( 1.625 )

∅ = 58.3924 ≈ 58.4°

Therefore, the angle of elevation is  58.4°

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation: