exam Maths Puzzle Numerical Ability

1/r=1/s+1/t....solve for s

w=a^2/t.....solve for t

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exam Other Question

Factor completely x^3 + 6x^2 + 5x I thought i had it and realize that i didnt. Help please.. Please help me in solving the quadratic equation x^2 - 7x + 12 = 0. Show all steps.