Tom received 89,94,86 and 96 on the first four algebra tests . what grade must he receive on his last test to have an average on 92

1. are the triangles similar and if so why? what is the value of x? show your work.

Which is the graph of the function y=2(4)^x

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.