A20ft ladder leans against a building and it touches the building 18ft above the ground. what is the angle of elevation that the ladder makes with the ground

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.

40 describe the outliers from the scatter plot.

If y varies directly as x2 and y=6 when x=6, find the constant of variation.