To determine the simplified equation corresponding to the measures of the angles, we first note that two angles are complementary if their measures add up to 90 degrees.
Given the angles \(3x^\circ\) and \((4x + 1)^\circ\), we can set up the equation:
\[ 3x + (4x + 1) = 90 \]
Now, simplifying the left side:
\[ 3x + 4x + 1 = 90 \] \[ 7x + 1 = 90 \]
Thus, the equation that corresponds to the measures of the angles is:
\[ (7x + 1)^\circ = 90^\circ \]
So the correct option is:
(7x+1)°=90°