Write the expression. Then, check all that apply. six times the sum of nine and a number A 2-column table with 5 rows. Column 1 is labeled Key Words with entries six, times, the sum of, nine, a number. Column 2 is labeled Replace with entries 6, times, (+), 9, n. Replace “a number” with the variable, n. The two operations are multiplication and addition. The two operations are multiplication and subtraction. The constants are 6 and 9. The expression is written as 6n + 9. The expression is written as 6(9 + n).