Express 0.5 as a fraction

a) 5/1000
b)5/100
c) 5/10
d) 5/1

Find the length of the following tangent segments to the circles centered at o and o' whose radii are 5 and 3 respectively and the distance between o and o' is 12. what is the tangent segment of cd?

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.