exam Maths Puzzle Numerical Ability

The length of a rectangle is 3in. more than the width. The perimeter of the rectangle is 24in.

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exam Other Question

solve if x E{1,2,3,4,5,6,}

1/2x = x/2

it's on page 42 a chapter test quetion. Thank you
Given f(x)=3^x, which statement is true?
a) f(x+y)=f(x)+(y)
b) f(x+y)=f(x)f(y)
c) f(xy)=f(x)+f(y)
d) f(x/y)=f(x-y)