exam Maths Puzzle Numerical Ability

Find the length of one base of a trapezoid if the area of the trapezoid is 46cm squared, the height is 4 cm and the length of the other base is 6cm.

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exam Other Question
how can i factorize this sum x^3-x^2+ax+x-a-1 ? please help me thanks f(a+b) = f(a)+ f(b) for all positive numbers a and b
a) f(x) = x squared
b) f(x) = x+1
c) f(x) = square root x
d) f(x) = 2/x
e) f(x) = -3x

Thanks,
Casey