The correct answer is: 8
Explanation:
Given mixed number:

In order to convert a mixed number into a decimal number, follow the steps mentioned below:
Multiple 7 with 5 and add the numerator to the answer you get by multiplying 7 with 5. After that, write that result in the numerator and divide it with 5:
Step-1:
Multiply 7 with 5.
7*5 = 35
Step-2:
Add numerator value, which is 4 in this case, in 35
35 + 4 = 39
Step-3:
Rewrite the fraction.

Step-4:
Calculate.

Now, as the number at the tenth place after the decimal point is greater than 5, we have to round it off to 8.0.
Hence the correct answer is 8.