exam Maths Puzzle Numerical Ability

Adult tickets for a play cost $11 and child tickets cost $10. If there were 23 people at a performance and the theater collected $246 from ticket sales, how many children attended the play?

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i need to write a slope-intercept equation with these characteristics. please help me

m= -2, passes through (-5,1)

can you break it down easy for me thanx Can you help me with rationalizing the denominator on the following: 2/(sqrt2 -1). I deeply appreciate your help..:)