Where is 1/12 inches on a ruler?

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

You wanted to draw an enlargement of design that printed on a card that is 4 in by 5