What is the unit cost per bottle if a pack of 12 bottles of juice sells for $6? $0.50 per bottle $0.72 per bottle $5.00 per bottle $7.20 per bottle

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

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.

What is the missing step in this proof ?