What is the value of b for the equation 5^6×5^b=5^12

The product of 3 and a number increased by 8 is 31 written as an equation

Acontainer full of water weighs 15.5 lbs. when ¼ of the water is poured out, the container now weighs 12 ½ lbs. how much does the container weigh when empty?

Iready kara is sorting buttons by length for a craft project the line plot shows the length of each button if kara lines up all the 3/4 inch buttons,what would be the total length