book Maths Puzzle Numerical Ability

How do I multiply 4x to the exponent 2, all cubed?

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book Other Question

Determine the amount of an investment if $1000 is invested at an interest rate of 6.2% compounded monthly for 2 years.

A.$1131.65 B.$2058.23 C.$1127.84 D.$4236.32
i need your help on this equasion ((( 67-3/4x=85 ))) i have no idea where to begin. thank you