exam Maths Puzzle Numerical Ability

Mario has 55 CDs. Write an expression to represent the total number of CDs he will have after 18 months if he buys x CDs per month.

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exam Other Question

it takes me 8 hours to reach city A from city B.if i increased my speed by 6 km. per hour it takes me one hour twenty minutes less.find the distance between the cities A and B. Can someone help me on this problem?

I need to rewrite the following equation as a function of x.

-3x + 4y = 11

Thank you,
Ashley