One of the fastest Times of a recorded for the 50 yard dash is 5.2 seconds the following expression can be used to find how many miles per hour that is what is the missing factor

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

Which graph shows a function with a range of all real numbers greater than or equal to -1

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.