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Answer :

Gotenks99go

2+x3, x is 3

= 2+(3)^3

= 2+27

= 29

x2, x is 12

= (12)^2

= 144

3x2+y, x is 5 y is 3

3(5)^2 + (3)

= 75 + 3

= 78

10y+x2, x is 6 y is 4

= 10(4) + (6)^2

= 40 + 36

= 76

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