Answer:
6 +7x
Explanation:
To write an English expression as an algebraic one, you must first understand what the English is telling you. Then the translation is straightforward.
Algebraic representation
A plus sign (+) signifies addition. Multiplication is signified several different ways. The simplest is writing the factors next to each other.
Parsing the English
The objects involved in the addition are 6 and a product:
6 + product
The product is said to consist of two factors: 7 and "a number". The instructions say to use "x" for "a number", so the product can be written ...
7x
Algebraic expression
Then the complete algebraic expression is ...
6 +7x