Hey there!
To start, first let's assign a variable to each person:
A to represent the miles biked by Albert
B to represent the miles biked by Bob
Now, let's set up a system of equations:
A=3B
A + B = 72
Next, use substitution (plug 3B in for A in the second equation since A is equal to 3B):
3B + B = 72
Then, simplify and solve:
3B + B = 72
(combine like terms)
4B = 72
(divide both sides by 4)
B=18
Now that you know the amount that Bob biked, you can plug his miles into the equation for Albert: A=3B
B=18
A=3(18)
A= 54
Your final answer would be that Albert biked 54 miles.
Hope this helps!
Answer: 3300
Step-by-step explanation: Three years is 15%, 15% of 22,000 is 3,300
I think this is the answer, tell me if it works
Answer:
Step-by-step explanation:
Given
comparing it with standard equation 
so 4a=1
so Focus of parabola is (0,0)
directrix
y=-a
here 
Answer:
the third number is 11
Step-by-step explanation:
the first number is 5 so the second number since its five times the first is 25 and the third being 14 less then the second is 11
so 5+25+11= 41
