Let the speed for the first 12 mi be x mi/h, the speed for 18 mi was (x+4) mi/h
thus given that
time=distance/speed
the average time will be:
3=(12+18)/(x+x+4)
3=30/(2x+4)
solving for x we get
3(2x+4)=30
6x+6=30
6x=24
x=4 mi/hr
Answer: 12 mi/hr
I wrote answers in picture and I use Desmos app to solve this equations
Answer:
10 $20 bills and 20 $5 bills
Step-by-step explanation:
The answer to your equation is 1,000^10
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