Help Please For My Math

Help please for my math

  1. x³+5x-19

Subtitute x=3

3³+(3)5-19

27+15-19

=23

2. x²+xy+y²

Substitute ,x=2,y=3

(2)²+(2)(3)+(3)²

4+6+9

=19

3.x²+xy²+4y

Substitute

x=4,y=6

(4)²+(4)(6)²+4(6)

16+144+24

=184

4.(2)²+2(2)(4)+3(4)²(6)+(6)²
4+16+288+36
=344

5. 5³+(5²)(7)+5(7²)(1)+(7³)(1²)+1³
=889

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