Andrew is 17 years old, which is 3 years more than twice as old as his sister. andrew's sister is a years old. which value of a makes the equation 17 = 2a + 3 true?

The system of equations graphed below has how many solutions? y = 2x + 2

What value of x will make the triangles similar by the sss similarity theorem?

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.