Answer:
The angle of elevation is 36.87 degrees
Step-by-step explanation:
see the attached figure to better understand the problem
In the right triangle ABC of the figure
----> by CAH (adjacent side divided by the hypotenuse)
substitute the given values
We have the cards numbered as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12.
Sample number is, n(S)=11.
We pick a card and want to get even number like 2, 4, 6, 8, 10, and 12.
Probability of picking an even number would be :-
P(even numbers) =
Now we replace the card and want to get a 7 in second attempt.
Probability of picking a 7 would be :-
P(number 7) =
Now Probability of this event = P(even numbers) × P(number 7)
Probability =
So final answer is .