It's 4/3 because of the distance formula
-0.75 is a rational number because it can be expressed as the fraction -3/4 and it is an integer
According to the trigonometric functions, we can see that angle x can be found through the one that involves the adjacent side and the hypotenuse, which in this case is the cos,

then, if we apply the inverse we can find the value of x,

Answer: