Two people are standing on opposite sides of a small river. One person is located at point Q, a distance of 25 meters from a bridge. The other person is standing on the southeast corner of the bridge at point P. The angle between the
bridge and the line of sight from P to Q is 73.8°. Use this information to determine the length of the bridge and the
distance between the two people.

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.

Find the quotient. 50a2 – 98b2 -5a +7b

What is the number 321,000,000 in scientific notation? also what is the number? ?