Final answer:
The question relates to determining the angles of a triangle using the given angle expressions. By applying the total sum of angles in a triangle, one can solve for x and then find the individual angles.
Step-by-step explanation:
The question appears to deal with the angles of a triangle, where m∠a is given as (48−x)°, m∠b as (9x−38)°, and m∠c as 90°. Given that the sum of the angles in any triangle is 180°, these equations can be used to solve for the value of x. Once x is determined, the measures of∠a and ∠b can be calculated.
The provided references, though, seem to contain miscategorized or irrelevant information not directly related to the question at hand.