First change both fractions so that they have a common denominator. The least common factor of 16 and 4 is 16. Therefore, your denominator will be 16.
[tex] 4 \frac{15}{16} = 4 \frac{15}{16} [/tex]
[tex] 7 \frac{3 \times 4}{4 \times 4} = 7 \frac{12}{16} [/tex]
Go ahead and add the 2 fractions:
[tex] 4 \frac{15}{16} + 7 \frac{12}{16} = 11 \frac{27}{16} \rightarrow 12 \frac{11}{16} [/tex]
Your answer is [tex] 12 \frac{11}{16} [/tex]
