Sam's grades
type grade
quizzes 73%
tests 87%
homework 92%
final exam 90%

sam's grades are shown in the table. the teacher calculates the overall grade as follows: quizzes and tests are each 30% of the overall grade, homework is 15%, and the final exam is 25%. what is sam's overall average?

Acity plans to build a new rectangular-shaped park. the perimeter of the park will be 940 meters. the width of the park will be 300 meters. what will be the length, in meters, of the new park?

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.

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.