book Maths Puzzle Numerical Ability

write answers in descending powers of x ADD
1.(xsquared+3x)+(4xsquared-2)

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book Other Question

4y-3(y+8)=12 can you please show how an tell how to solve the speed of a boat in still water is 24 mph. if the boat travels 54 miles upstream in the same time it takes to travel 90 miles downstream, find the speed of the current.