When solving a system of equations, Jared found \( y=x+ \) 10 for one equation and substituted \( x+10 \) for \( y \) in the other equation. Nicole found \( x=y-10 \) for the same equation and substituted \( y-10 \) for \( x \) in the other equation. Who is correct? Explain.

Find the indicated value of the function \( f(x, y, z)=6 x-5 y^{2}+5 z^{3}-7 \). \( f(6,-6,3) \) \( f(6,-6,3)=\square \)

12.3 The equations \( x^{2}+a x+b=0 \) and \( x^{2}+b x+a=0 \) both have real and equal roots. Solve for \( a \) and \( b \), where \( a>0 \) and \( b>0 \).

a) \( \left(-2 x^{2}\right)\left(x^{2}-2 x+3\right) \frac{1}{2} \)

If \( x-6=0 \) is one of the solutions of the equation \( x+\frac{40}{x}=16 \), determine ONE value of \( y \) for which \( 2 y+3+\frac{40}{2 y+3}=16 \)

Qual è il grado di un polinomio se la funzione \( f(x) = 2x^4 - 3x^3 + x - 5 \)?