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DrFrost Math-Proportionality

r is directly proportional to the cube of s.
r = 18 when s = c
Find r when s = 3c
What have you tried so far?
Assuming you have written down mathematically what "r is directly proportional to the cube of s" means, plugging in r = 18 and s = c gives you a relation between c and the proportional constant k.

If you are afraid of the c, try experimenting with c=1, c=2, c=3... and see what happens.
Original post by tonyiptony
What have you tried so far?
Assuming you have written down mathematically what "r is directly proportional to the cube of s" means, plugging in r = 18 and s = c gives you a relation between c and the proportional constant k.

If you are afraid of the c, try experimenting with c=1, c=2, c=3... and see what happens.

will try

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