To determine the correct equation that represents the measures of the angles given that they are complementary, we start with the definitions.
Complementary angles add up to 90 degrees. The two angles are given as:
- \( 3x^\circ \)
- \( (4x + 1)^\circ \)
Since these angles are complementary, we can write the equation:
\[ 3x + (4x + 1) = 90 \]
Now, let's simplify this:
- Combine like terms: \( 3x + 4x + 1 = 90 \)
- This simplifies to: \( 7x + 1 = 90 \)
Thus, the corresponding simplified equation is:
\[ (7x + 1) = 90 \]
So, the correct response from the options provided is:
(7x + 1)° = 90°.