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2x3 - 7 + 5x - x3 + 3x - x3 = 8x - 7
the answer is $64.61 you start with 3 and then 3x3=(9)x3=(27)x3=(81)x3=(243)x3=(729)x3=(2187)x3={6561} then you divide 6561 by 100 because they are pennies so 6561/100 is 65.61 dollars hope this helps and i just kept tripling it 7 times because it says by the end of the week =)
x3 + 8 = x3 + 23 = (x + 2)[x2 - (x)(2) + 22] = (x + 2) (x2 - 2x + 4)
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y2=x3+3x2