exam Maths Puzzle Numerical Ability

For the following probability distribution u=_____

xi 250/300/400
pi 0.30/0.50/0.20

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exam Other Question

can someone Please show me how to solve inequality, giving its solution set in both intervals and graph forms, and check my answer? Thanks!

m - 2(m-4) is less than or equal to
I am totally lost, I do not know where to even start, I'm so embaressed, I have never been good at graphs let alone logarith equations. Can a tutor please try and solve this equati