The line graph shows the total amount of snow, in inches, recorded each year in Washington, DC, from 2003 to 2015. If p% is the percent decrease in the annual snowfall from 2003 to 2007, what is the value of p ? 

The correct answer is 75. The percent decrease between two values is found by dividing the difference between the two values by the original value and multiplying by 100. The line graph shows that the annual snowfall in 2003 was 40 inches, and the annual snowfall in 2007 was 10 inches. Therefore, the percent decrease in the annual snowfall from 2003 to 2007 is \(\left(\frac{40-10}{40}\right)(100)\), or 75. It’s given that this is equivalent to p%, so the value of p is 75.