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8090 [49]
4 years ago
10

If f(x) varies directly with x2, and f(x) = 40 when x = 2, find the value of f(6). 36 60 120 360

Mathematics
2 answers:
nadya68 [22]4 years ago
8 0

Answer:


Step-by-step explanation:


pav-90 [236]4 years ago
7 0
<span>The answer is 360.
f(x) varies directly with x^2 and f(2) = 40. What does that mean?</span>
<span>It means this f(x) = k* x^2. We need to find k.
For x=2, f(x) = 40, this means k* x^2 = 40. BUT, x=2.
This means p* 2^2 = 40. => k = 40 / 4 = 10.
We just found what f(x) is: f(x) = 10x^2.
Now, what is the value of f(6)?
Just replace the value of k by 10. => f(6) = 10* 6^2 = 10*36 = 360</span>
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A countertop is 16 feet long and 3 feet wide. what is the area of the countertop in square meters.
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