The expression \( 35x + 55y \) represents Anthony's total spending on shoes and jerseys, where:
- \( x \) is the number of pairs of shoes he buys, and
- \( y \) is the number of jerseys he buys.
In this expression:
- \( 35x \) indicates the total amount spent on shoes, where \( 35 \) is the cost per pair of shoes.
- \( 55y \) indicates the total amount spent on jerseys, where \( 55 \) is the cost per jersey.
Regarding the specific part of the expression \( 35x \):
- "He spends $35 on a pair of shoes." - This statement is true in the context of \( 35x \), as \( 35 \) is the price per pair of shoes.
- "He spends on a pair of shoes." - This statement is incomplete and unclear.
- "He spends $35 for a pair of shoes." - This statement is also true, as it reaffirms that \( 35 \) is the price for each individual pair of shoes.
Based on this analysis, the correct interpretation of the part of the expression \( 35 \) is that "He spends $35 for a pair of shoes." So the best interpretations would be both 1 and 3, with 3 being the most direct interpretation of the part of the expression.