This question is asking about the value of the angle that gives us a sine of 4/15.
To find this angle, we need to use the inverse function of the sine function which is called arcsin function, and it is also represented as:
![\arcsin (x)=\sin ^(-1)(x)](https://img.qammunity.org/2023/formulas/mathematics/college/hm2fjx6aq114ed4u5jnm3nxuyby93ityly.png)
Then, to find the angle, we need to apply the latter function on both sides of the equation as follows:
![\arcsin (\sin (x^(\circ)))=\arcsin ((4)/(15))=\sin ^(-1)((4)/(15))=15.4660099534](https://img.qammunity.org/2023/formulas/mathematics/college/30tphbnwujq7m0v5hfhbn2torbmjsuiffx.png)
We need to be careful that the value that gives us a calculator is in degrees (as in this case).
If we round the answer to the nearest tenth, we finally have that:
![\arcsin (\sin (x^(\circ))=x^(\circ)=15.5](https://img.qammunity.org/2023/formulas/mathematics/college/jm8inq2tr9vqvbusfndwq49nb90ed7hnsb.png)
In summary, the value for angle x° is equal to 15.5° (third option).