exam Maths Puzzle Numerical Ability

Could you explain why the line x = 4 is a vertical line. I need help.

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Yolanda

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Tutor could you help me please?

How do I determine whether the graph of y=x^3-2x is symmetric with respect to the x-axis, the y-axis and/or the origin?

thank you Jim has a jar of dimes, nickels, and pennies. He has one dime more than five times the number of nickels and four times as many pennies as nickels. How many of each coin are in the jar if the total value is $7.77?