How are these two problem different 35-15 and 43-26

Acircle has a circumference of 28.36 units what is the diameter of the circle

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

The architect's side view drawing of a saltbox-style house shows a post that supports the roof ridge. the support post is 8 ft tall. the distance from the front of the house to the support post is less than the distance from the post to the back of the house. how far from the front of the house is the support post positioned?