exam Maths Puzzle Numerical Ability

Twice the number of pansies exceeded 4 times the number of daises by 8. Also, 7 times the number of daisies was 4 less than 3 times the number of pansies. How many of each were there?

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I need to factor completly

x^8-1
and
y^3+125 Stan invested $17,000, part at 18% and part at 4%.

If the total interest at the end of the year is $1,380, how much did he invest at each rate?