SAT Question 1bf809b5: Right Triangles And Trigonometry answer and explanation with Desmos solution

The cosine of an acute angle in a right triangle is defined as the ratio of the length of the leg adjacent to the angle to the length of the hypotenuse. In the triangle shown, the length of the leg adjacent to the angle with measure $x^{\circ }$ is $11$ units and the length of the hypotenuse is $28$ units. Therefore, the value of $\cos x^{\circ }$ is $\frac{11}{28}$. Note that 11/28, .3928, .3929, 0.392, and 0.393 are examples of ways to enter a correct answer.