Jon makes 78 in 12 hours of work fo his mom how much would jon make in 20 hours or work

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

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?