exam Maths Puzzle Numerical Ability

Find the length of each side of the polygon for the given perimeter. P= 48 cm

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exam Other Question

How many four-digit numbers can be formed from the digits 0,1,2,3,4,5 if no repetitions are allowed and 0 cannot be the first digit? HELP PLEASE!!
What is the rule for the nth term :

d = -12 and a(subscript 1) = 80

Thanks very much

llo