Answer:
Step-by-step explanation:
20 matches, so there is 40 players in the club.
First number too chole 2 first players for match you can do it in .
Now you have 38 players, becaus you chose 2. Now frim 38 player you can choose new 2 in ways. So and on... you will have ways to choose 20 matches in:
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a
Answer: x = 20.
x and (3x + 10) combine to form a right angle, shown in the diagram by the small square joining the perpendicular lines.
Right angles are 90 degrees, so you can add both angles to get 90:
The frequency is 1 /period = 1 / [ 2 pi ]