exam Maths Puzzle Numerical Ability

a)x^2-2x=15
b)3x^2+19+1=0
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exam Other Question

Find the number of terms and the sum of the series 7+17+27+...+107 A regular pentagon can be dissected into 5 isosceles triangles whose vertex angle is at the center of the pentagon. The height of the triangle is 10 cm. find the area of this pentagon.