exam Maths Puzzle Numerical Ability

How do I write this serie using sigma notation?

1/2 + 2/3 + 3/4 + ... 99/100

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i really need someones help with this problem

Find the slope of the line that passes through...
(-6,-5)and(4,1)
thanks a bunch Find all solutions of the equations in the interval [0, 2π) algebraically.

sec�x � secx = 2