3 years ago

The russian ruble coin had a radius of 10.25 mm. What is the circumference in terms of pi

1 answer:

Ronch [10]3 years ago

7 0

Try this solution:
Circumference=2*π*radius=2*π*10.25=20.5π (mm).

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SashulF [63]

For this case we have that by definition, a direct variation is given in the form:

$y = kx$

Where:

k: It is the constant of proportionality

According to the statement we have to:

$y = 25\\x = 4$

Substituting:

$25 = k4\\k = \frac {25} {4}$ $k = 6.25\ for\ \frac {dollars} {hour}$

On the other hand we have:

$y = 4\\x = 25\\4 = k25\\k = \frac {4} {25}$

$k = 0.16\ for\ \frac {hours} {dollar}$

Answer:

$k = 6.25 for \frac {dollars} {hour}\\k = 0.16 for \frac {hours} {dollar}$

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3 years ago