book Maths Puzzle Numerical Ability

here is a question that the teacher through out there in hopes that I knew the answer. 4a (a-1)+3a(cubed)(2a-4)-5(3a Cubed+2-1 and the answer that he put on the board was 4a cubed

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Any help is appreciated, Thank you!

You want to have $40,000 to buy a new boat in six years. How much do you have to save at the end of each year to reach this goal if you earn Make a line plot or bar graph of a set of data that fits the description

1. 24 names witha arange from 8 letters to 20 letters
2. 7 names,with a median length of 14 lengths