Solve using elimination, \[ \begin{array}{c}x+y=-5 \\ -5 x+y=15\end{array} \]

Simplify. \[ \frac{y^{2}-x}{y^{-2}+x^{-2}} \] Write your answer using only positive exponents

Joseph and Faith leave at the same time from the same point of a long circular track, he on foot and she by bike. Faith completes a lap 24 minutes before Joseph and waits for him while having an ice cream. When he reaches this point, Faith leaves with her bike in the opposite direction and Joseph continues walking without stopping in the same direction. Then they meet 5 minutes later. Assuming the speeds are kept constant, how long does it take for Joseph to take a ride on the track?

a) \( x^{2}-3 x+2=0 \)

1)) Find \( (b \circ c)(x) \). \( b(x)=2 x-3 \) \( c(x)=-4 x+10 \) (b)) Write your answer as a polynomial in simplest form. (b०c) \( (x)=\square \)

Simplify. \[ \frac{\frac{5}{v}+\frac{5}{u}}{\frac{1}{v^{2}}-\frac{1}{u^{2}}} \]