Final answer:
The provided question about the unit circle and value of x where 'm=7/4' is unclear since 'm' typically represents slope, not an angle measure relevant to the unit circle. No accurate response can be provided without additional context or clarification.
Step-by-step explanation:
The question on the unit circle where m=7/4 seems to be incorrect or incomplete, as m typically represents slope in a coordinate context, which is not directly related to the unit circle.
In the context of a unit circle, one would expect an angle measure (like radians or degrees), not a slope.
Since the question seems to require clarification, an accurate response cannot be provided for the value of x on the unit circle without additional context.
Regarding the other questions provided, they pertain to vectors, slopes, and magnitudes, which are topics within physics and mathematics.
Without the proper context or information about the variable 'm' on the unit circle, we cannot accurately calculate the value of 'x' in simplest form as requested.