lllamasarebae3061
04.06.2021 •
Mathematics
The variables y and x^2 are directly
proportional. It is given that the difference
between the values of ý when x = 2 and x = 5
is 20. Form an equation relating y and x.
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Ответ:
y = x²
Step-by-step explanation:
Given that y and x² are directly proportional then the equation relating them is
y = kx² ← k is the constant of proportion
When x = 2
y = k × 2² = 4k
When x = 5
y = k × 5² = 25k
Then
25k - 4k = 20 ( difference between values is 20 )
21k = 20 ( divide both sides by 21 )
k =
y = x² ← equation of proportion
Ответ:
380
Step-by-step explanation:
pi = 3.14
the formula to solve this is
area = π · r2
so do
3.14*11^2