UnScramble this Word: o d b e u r s?

Questions

An estimated __________ lab mistakes are made in the 100,000 laboratories in the U.S. every day?

The average 60-minute audio cassette tape has _______ feet of tape in it?

The B-2 Stealth Bomber is designed to fly undetected by?

In Milwaukee during the 1900s, ______ horses in the city left an estimated 133 tons of manure and urine on the streets per year?

In Milwaukee during the 1900s, 12,500 horses in the city left an estimated ____ tons of manure and urine on the streets per year?