Solve The Following Algebraically Can You Help?

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Anonymous answered
(-125)^(4/3)
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You purchased 12 pens and 5 notebooks for $11.10.Your friend bought 2 pens and one notebook for $2.10.How much will one pen and one notebook cost?
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You buy 12 pens and 5 notebooks for $11.10 and your buys 2 pens and one notebook for $2.10. How much will one pen and one notebook cost?
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Anonymous answered
A)1/4=3-2x-1/x+2

2x+(1/x+2) = 3-1/4

2x+(1/x+2) = 11/4
2x+1/x = 11/4 - 2
2x^2+1/x = 3/4

B)x3/2 =125

X^3/2 = 125
X^3 = 125x2
X^3 = 250
x = cuberoot(250)
x= 6.29

C)squaretroot:3/x-4=2
squaretroot:3/x=2 +4
squaretroot:3/x=6
3/x=6^2
3/x = 36
x = 3/36
x = 1/12

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