In Sareena's neighborhood, the numbered streets run North and South, parallel to each other. Sareena lives on 12th Street. She walks from her home to the school, which is on 14th Street. Then, after school, she walks from the school to the super market on 9th Street.

The number of blocks Serena walks from the school to the supermarket is x * 5 blocks

Step-by-step explanation:

The question asks the number of blocks Serena walks from the school to the supermarket

The location of Serena's school is on the 14th street and the location of the super market is on the 9th street, therefore the number of blocks Serena walks from her school to the super market is given as follows;

Number of street between Serena's school and the super market = 14 - 9 = 5 streets

Number of blocks street each street = x blocks

Number of blocks Serena walks = x * 5 blocks.