In the U.S., a dental crown costs between \( \$ 600 \) and \( \$ 3,000 \). In Costa Rica, a crown is the equivalent of about one-third the cost in the U.S.. Write an inequality for the possible cost \( (x) \) of a dental crown in Costa Rica.

2imalify \( \frac{x^{2}-y^{2}}{x^{2} x y} \) \( \frac{y+2 x-3 y}{3 x-2 y}=4 \), evaluate \( 2 x y \) If \( z=\sqrt{x^{2}-y^{2}} \), express \( x \) interm 9 \( y \) and 2

November 2018 ZIMSEC Paper 1 Solve the following simultancous equations: \[ \begin{array}{l}e^{2 x+y}=1 \\ 4 x-3 y=10\end{array} \]

\( \left\{ \begin{array} { l } { 2 x y - y = 7 } \\ { x - 5 y - 2 } \end{array} \right. \)

\( \therefore \sqrt { x } ( x ^ { \frac { 5 } { 2 } } + x ^ { 2 } + 5 ) \)

2.3 Express \( \frac{1}{\sqrt{2}+1} \) in its simpl