At what angle of elevation must
a 5.2 meter ladder be placed to
reach a vertical height of 3.8
meters on a wall?

Angle of elevation,

Step-by-step explanation:

We have,

Height of a wall, AB = 3.8 m

Length of the ladder, AC = 5.2 m

It is required to find the angle of elevation. According to the attached figure, it is clear that we can find angle of elevation using trigonometry. such that,

So, the angle of elevation must be 46.88 degrees.      

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answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.