On an item with marked price Rs. 1000 , a customer has a choice between successive discounts of \( 5 \%, 8 \% \) and \( 10 \% \) and successive discounts of \( 10 \%, 15 \% \) and \( 10 \% \). By choosing the better offer, he can save approximately:

11. What is the value(s) of \( x \) in the equation below? \( -0.4|x+5.75|-4.3=-8.7 \)

10. Determine the solution to the system below. Desmos Matrix Calculator \( 2 x+2 y+2 z=10 \) \( x-3 y+4 z=18 \) \( x+y=-2 z \)

\( \overline { \sin ( \overline { z } ) } = \sin ( \overline { z } ) \)

Use the guadratic formula to solve for \( x \), \( 6 x^{2}-8 x-1=0 \) (If there is more than one solution, separate them with commas.)

\( f ^ { \prime } ( x ) = ( \frac { 1 } { 2 \sqrt { x } } + x ^ { - 1 / 2 } ) ^ { 2 } - ( \frac { 1 } { 2 \sqrt { x } } - x ^ { - 1 / 2 } ) ^ { 2 } \)