The rate of change between point a and point b is to what is the rate of change between point c and point did d -2 - 1/2 1/2 or 2

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3