Question

Can you help me with it please​

Answer 1

`(20)/(29)`

Explanation:

Equation of unit circle is:

`x^2 + y^2 = 1`

Plug
`y = (-21)/(29)` in above equation.

`x^2 + \bigg( (-21)/(29)\bigg)^2 = 1\\\\</p><p></p><p>x^2 + (441)/(841) = 1\\\\</p><p></p><p>x^2 = 1-(441)/(841)\\\\</p><p>x^2 = (841-441)/(841)\\\\</p><p>x^2 = (400)/(841)\\\\</p><p>x =\pm\sqrt{ (400)/(841)}\\\\</p><p>x =\pm(20)/(29)\\\\</p><p>`

Since, point P is in the fourth quadrant.

Therefore, x - coordinate should be positive.

`\huge \red {\boxed {\therefore x =(20)/(29)}} \\\\</p><p>`