exam Maths Puzzle Numerical Ability

A sailboat sail in the shape of an isosceles triangle has a base that is 9 feet longer that either of the equal sides. If the perimeter of the sail is 21 feet, then what is the length of the base of the sail?

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I just don't get it. Yn = 74

Assume that a circuit in your house has items connected to it that consume 8 amps of a 15 amp circuit. You are going to connect (Yn) - 100 watt bul -2[3a-2(4a-1)]+2=2a+3-3 please help me solve this problem i am having alot of trouble. thanks much!