A customer purchases a solar energy system for their home. After six months they owe $6480 on the system. After 20 months they owe $5220.

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.

What expression is equivalent to log3(x+4)

What’s the answer ? use the picture to see the problem