When Luke left his house in the morning, his cell phone battery was partially
charged. The charge remaining in Luke's battery, as a percentage, can be modeled by
the function B(t) = 54 – 4.5t, where t is the number of hours since Luke left his
house. What is the x-intercept of the function and what is its interpretation in the
context of the problem?
The x-intercept of the function is
which represents
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attempt i out of 2

In a certain pentagon, the interior angles are a,b,c,d,e where a,b,c,d,e are integers strictly less than 180. ("strictly less than 180" means they are "less than and not equal to" 180.) if the median of the interior angles is 61 and there is only one mode, then what are the degree measures of all five angles?

The system of equations graphed below has how many solutions?

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.