book Maths Puzzle Numerical Ability

Hi My Name is sam and I need some help on my algebra homework pleases and thank you ok it says evaluate the variable expression when s=2 and t=4.here is the questions
(t-s)3=

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3) A rectangle with an area of 108 is divided into 3 equal squares. What is the perimeter of the rectangle? The executive committee of the student government consists of 10 members. In how many ways can a subcommittee of 3 members be chosen? Thank you for your help.