To solve for \( u \) in the equation \( u + 2.1 = 8.15 \), you can subtract \( 2.1 \) from both sides:
\[ u = 8.15 - 2.1 \]
Calculating the right side:
\[ u = 6.05 \]
So, \( u = 6.05 \).
To solve for \( u \) in the equation \( u + 2.1 = 8.15 \), you can subtract \( 2.1 \) from both sides:
\[ u = 8.15 - 2.1 \]
Calculating the right side:
\[ u = 6.05 \]
So, \( u = 6.05 \).