- (2x-20)°+(x+65)°=180°
- 2x-20+x+65=180
- 3x+45=180
- 3x=180-45
- 3x=135
- x=135/3
- x=45°
How many solutions does 3x+2y=6 and -4+5y=15 have
1 answer:
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Answer
Find out the how long did they rest in 8 hours.
To prove
As given
contestants in a dance-a-thon rest for the same amount of time every hour.
A couple rests for 25 minutes in 5 hours .
As
25 mintues = 5 hours
1 hours = 5 mintues
Thus in 1hours a the dance -a-thon rest for 5 mintues.
Now for 8 hours.
8 hours = 8 × 5 mintues
= 40 mintues
Therefore in 8 hours a dance-a-thon rest for 40 mintues.