5: (4 3/4 - 0,25) + 2,9;

1. Convert mixed number and decimal to fractions: (19/4 - 1/4) + 29/10.

2. Perform subtraction inside parentheses: 18/4 + 29/10.

3. Simplify and add fractions: 9/2 + 29/10 = 45/10 + 29/10 = 74/10 = 7.4.