Posted by StuartKess on .
S is directly proportional to M^3. It is given that S=36 for a certain value of M. Find the value of S when this value of M is
(a) doubled
(b) reduced by 40%

Math 
bobpursley,
S=k*M^3
so if M is doubled, S must go up by 8 (2^3)
so if M is changed to .4, S must be down by .6^3=.216
answers:
a) 36*8
b) 36*.216