If one angle of a set of alternate interior angles on parallel lines measures 77°, then the other angle also equals 77°

always

sometimes

never

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

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)