exam Maths Puzzle Numerical Ability

The formula for calculating the amount of money returned for deposit money into a bank account or CD (Certificate of Deposit) is given by the following:
A=P(1+r/n)
A is the amou

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Find the polynomial that represents the volume of the rectanglar solid.
(x+2)(x+4)(x-5) I need help with the Echelon Method on this problem
x-y+z=4
x+y+z=10
2x+y-3z=7
I understand the gauss jordan method to solve this but not the echelon?
3 variables throws me o