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-20 yards

Step-by-step explanation:

Given : Bobby’s football team received four five-yard penalties in the first quarter.

i.e. Number of five-yard penalties in the first quarter =4

It meant his team lost yardage in their progress toward the goal line.

Then, the  change in their progression down the field as a result of these penalties :

Hence, the  change in their progression down the field as a result of these penalties = -20 yards