If a box with square cross section is to be sent by the


Postal Restrictions If a box with square cross section is to be sent by the postal service, there are restrictions on its size such that its Volume is given by V= x²(108-4x), where x is the length of each side of the cross section (in inches).

(a) Is V a function of x?

(b) If V= V(x), find V(10) and V(20).

(c) What restrictions must be placed on x (the domain) so that the problem makes physical sense?

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