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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Solve 5(x + 1) = -15 I do not understand how to tell when to use combination and when to use permutation. The word problem is: Jack has seven frozen meals in his freezer. How many ways can he choose to have them for dinner Sunday through Saturday?