exam Maths Puzzle Numerical Ability

How do u factorize 82 into its primes?

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exam Other Question

Graph inequality.
3x+4y is less than or equal to 12. hi, i am needing help with this question from a hand out..

f:R to R is defined by f(x)=2x+1 then f^-1=

i came up with 2x-1 as my answer..can you help verify? thanks