The amount of stretch of a hanging spring versus the mass attached to the bottom of the spring was measured for different masses the results are shown in the table. Mass (grams): 2 , 4 , 8 , 10
Stretch (centimeters): 4 , 8 , 16 , 20
What is the constant of proportionality between the mass and the amount of stretch?
A. 0.5 centimeters per gram
B. 0.5 grams per centimeter squared
C. 2.0 centimeters per gram
D. 2.0 grams per centimeter squared

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

Find the actual dimensions of the box. the side length are in meters and integers. the surface area of the box is 104 m2 and volume of the box is 60 m3.

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse. a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?