book Maths Puzzle Numerical Ability

Can you please tell me what is this called: ∈
And can you please also notifie me with some mathematical symbols

Thanks

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book Other Question

Raeo Corp. bonds trade at 100 today. The bonds pay semiannual interest that is paid on Janauary 1 and July 1. The coupon on the bonds is 10 percent. How much will you pay for a Rae solve - 2/3(x-5)=1+3/4(2-3x)