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vredina [299]
3 years ago
10

the diameter of a tree varies directly with its age. A 15-year old tree has a 3.75 in diameter. How old will the tree be when it

has a 20 in diameter?
Mathematics
1 answer:
dlinn [17]3 years ago
5 0

Answer:

x=15*25/3.75

x=100

tree is 100y old

Step-by-step explanation:

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two pumps of different sizes, working together, can empty a fuel tank in 3 hours. the larger pump can empty the tank in 4 hours
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Suppose the larger pump alone can empty the tank in L hours, and the smaller pump can finish the job in S hours, then each hour the large pump empties 1/L portion of the tank, and the small pump empties 1/S per hour
Working together for three hours, they empty the whole tank, which is 100% of it, so 3/L+3/S=100%=1
Larger pump can empty the tank in 4 hours less than the smaller one, so L=S-4
replace L: 3/(S-4)+3/S=1
Make the denominator the same to solve for:
3S/[S(S-4)] +3(S-4)/[S(S-4)]=1
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S is about 8.6
The answer is not whole hour. 


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3 years ago
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What is the equation of a line, in general form, that passes though points (-1,2) and (5,2)?
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Answer:

A

Step-by-step explanation:

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