Question 1

Can someone help me please

Question 2

Explanation:

11.

(x - 4)/( (x)/(4) - (4)/(x) )

$\frac{x - 4}{ \frac{ {x}^(2) }{4x} - (16)/(4x) }$

$\frac{x - 4}{ \frac{ {x}^(2) - 16 }{4x} }$

(x - 4)/( ((x + 4)(x - 4))/(4x) )

(4x)/(x + 4)

12.

$\frac{ \frac{ {x}^(2) - 1 }{x} }{ \frac{(x - 1) {}^(2) }{x} }$

$\frac{ {x}^(3) - x}{ {x}^(3) - 2 {x}^(2) + x }$

$\frac{x( {x} - 1)(x + 1) }{x( {x} - 1) {}(x - 1) }$

(x + 1)/(x - 1)

13.

$\frac{ \frac{ {t}^(2) }{ \sqrt{ {t}^(2) + 1} } - \sqrt{ {t}^(2) + 1} }{ {t}^(2) }$

$\frac{ \frac{ {t}^(2) }{ \sqrt{ {t}^(2) + 1 } } - \frac{ {t}^(2) + 1}{ \sqrt{ {t}^(2) + 1 } } }{ {t}^(2) }$

$\frac{ \frac{1}{ \sqrt{ {t}^(2) + 1 } } }{ {t}^(2) }$

$\frac{ - \frac{ \sqrt{ {t}^(2) + 1 } }{ {t}^(2) + 1 } }{ {t}^(2) }$

$- \frac{ \sqrt{ {t}^(2) + 1} }{ {t}^(2)( {t}^(2) + 1) }$

14.

$\frac{3x { }^{ (1)/(3) } - x {}^{ ( - 2)/(3) } }{3x {}^{ - (2)/(3) } }$

(3x - 1)/(3)

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