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Maths Puzzle
Numerical Ability
This is from integrational calculus.
Find the upper and lower sum of equation y=sqrt(x) on intrevals [0,1]
thank you.
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book Other Question
Lane invested $10,000, part at 15% and part at 14%.
If the total interest at the end of the year is $1,430, how much did she invest at 15%?
2x+5y+z=39
3x-2y-z=1
2x+y+3z=27