Hailey is 2 years younger than her sister. If Hailey is \( h \) years old, which equation represents the age of her sister, \( s \) ? \[ \begin{array}{ll}\text { (A) } s=2 h & \text { (C) } h=2 s\end{array} \]

tinh \( a x^{2}+2 x+3 y=6 \)

5.7 Determine the equation of \( h \) if \( h(x)=g(x+1)-2 \)

Roger was told to think of a number, add 20 , then divide the result by 3 . The answer was Jower than Roger's original number. Deteruine the range of possible numbers Roger may have originally chosen.

Subtract the polynomials: \( (5x^{3} + 2x^{2} - 7) - (3x^{3} - x^{2} + 4) \)

Diketahui sistem persamaan tinier berikut ini : \[ \begin{array}{l}-1 x+y+2 z=2 \\ 3 x-1 y+z=6 \\ -1 x+3 y+4 z=4\end{array} \] Tentukan solusi persamaan linear tersebut menggunakan metode gauss!