D: 657.825
Start by converting 5 1/4 to a decimal. I’m assuming you have memorized 1/4 as a decimal, but if you haven’t yet, it’s 0.25. Add 0.25+5=5.25
One bag covers 125.3 ft square, but we have 5.25 bags. Change the one to 5.25 and multiply by 125.3.
Multiply 5.25x125.3
It equals 657.825
Hope this helps, reach out if you’re still confused!