What is the opposite of –0.8?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Carl is hanging pictures in his home. there is a space on a wall that has a width of 4 feet. carl has pictures with different widths. which picture width would fit in the space on the wall? a. 46 inches b. 60 inches c. 50 inches d. 54 inches

Ineed some on this. not sure how to solve.