Answer:
1,225 miles = 77616000 inches
Step-by-step explanation:
It is asked to find the number of inches in 1,225 miles
Given 
1 inch ≈ 1.578 × 10^-5 miles
Therefore, 1 mile  = 63360 inches
Therefore, 1,225 miles = 1225 x 63360 inches
                  1,225 miles = 77616000 inches
or               1,225 miles = 7.7 x  inches
 inches
Therefore the final answer is 
1,225 miles = 77616000 inches
or               1,225 miles = 7.7 x  inches
 inches