exam Maths Puzzle Numerical Ability

My question is: Why is line x=4 a vertical line?

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exam Other Question

simplify

(6^(x-5)) / (6^(3-x)) A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is $91.00. How much is invested at 8%. Can you show me how you work it out and solve it?