exam Maths Puzzle Numerical Ability

3/x + 4/5x2-7/25x

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exam Other Question

Please help me solve for a,b,c, and d

a+b+c+d=8
a+b+c+2d=7
a+b+2c+3d=3
a+2b+3c+4d=4 how do i find the lateral area of a regular hexagonal pyramid with base edge 10 and lateral edge 13