Solve r 2r + 9 = 7 - 3r
2 answers:
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To determine how much will it take to clean a 120ft driveway considering that it took him 2hs to clear 10ft and that the cleaning rate is constant, you can use cross multiplication:
10ft______2hs
120ft_____xhs
If the cleaning rate is the same, then the ratios between both are the same:
From this expression, you can determine the time by multiplying both sides of the equal sign by 120
It will take him 24 hours to clear the 120ft driveway.
Answer:
25 miles per hour
Step-by-step explanation:
Given
The joint variation can be represented as:
Where:
Required
Find V, when:
We have:
Express as an equation
Where k is the constant of variation
Make k the subject
When:
We have:
When:
We have:
Substitute: and
Make V the subject