9,999 can be written in word form as ........

Here are the answers to your questions:

5. $\text{9,999}$ can be written in word form as ............

   • 5. Ninety nine thousand and nine
   • 6. Nine thousand and nine
   • 7. Nine thousand, nine hundred and ninety-nine
   • 8. Nine thousand and nine hundred

   The number $\text{9,999}$ is read as nine thousand, nine hundred and ninety-nine.

   The correct option is $\boxed{\text{7. Nine thousand, nine hundred and ninety-nine}}$

6. The two types of data are primary data and ............

   • A. Tertiary data
   • B. Secondary Data
   • C. junior high data
   • D. Kg Data

   The two main types of data based on their source are primary data (collected directly) and secondary data (collected from existing sources).

   The correct option is $\boxed{\text{B. Secondary Data}}$

7. Primary data is also called ............

   • A. first-hand data
   • B. second-hand data
   • C. third-hand data
   • D. fourth-hand data

   Primary data is collected directly by the researcher, making it first-hand data.

   The correct option is $\boxed{\text{A. first-hand data}}$

8. A data collected by someone is called ............

   • A. Tertiary data
   • B. Secondary Data
   • C. primary Data
   • D. Kg Data

   Data collected directly from the source by a person for a specific purpose is known as primary data.

   The correct option is $\boxed{\text{C. primary Data}}$

9. The sum of 9 and K is written as ............

   • A. 9-K
   • B. 9 x k
   • C. 9 $\div$ K
   • D. 9 + k

   The word "sum" indicates addition.

   The correct option is $\boxed{\text{D. 9 + k}}$

10. Subtract 6 from the product of 9 and g is written as ............

    • A. 6 - 9g
    • B. 6 + 9g
    • C. 9g - 6
    • D. 6 - 9+g