Answer:
"The sum of the product of 9 and a number and 1."
Explanation:
9n + 1
The plus '+' represents addition. We would begin the word phrase with: "The sum of..."
We are adding 9n and one.
9 and 'n' are being multiplied. So, that term as a phrase would be "the product of 9 and a number".
All together, the phrase for '9n+1' would be "the sum of the product of 9 and a number and one".
Hope this helps.