exam Maths Puzzle Numerical Ability

find area or trapezoid

bas3 = 8 & 4 in non parallel sides are 5 & 7 in. perimeter = 24

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exam Other Question

1/3 + (-5/6) + (-1/2) OK I have no idea about these at all. The parenthesis are actually "longer" than a normal parenthesis. I have read all about these and nothing is sinking in for some reason, can someone help me please? factor: 18-3n