Which of the following is the most appropriate unit to describe the rate at which data is transferred using the internet?

Question

A. Megabits per second, because the independent quantity is time in seconds and dependent quantity is amount of data in megabits
B. Seconds per megabit, because the independent quantity is time in seconds and dependent quantity is amount of data in megabits
C. Seconds per megabit, because the iIndependent quantity is amount of data in megabits and dependent quantity is time in seconds
D. Megabits per second, because the independent quantity is amount of data in megabits and dependent quantity is time in seconds ***

2 + (x + y) = (2 + x) + y is an example of which algebraic property?
A. Distributive Property
B. Associative Property of Addition
C. Commutative Property of Addition ***
D. Symmetric Property

Which of the following best represents the average rate at which the human hair grows?
A. 0.25inches per second
B. 0.25 meters per hour
C. 0.25meter per month
D. 0.25 inches per month ***

Charles wants to determine which car is the fastest. The actual speed of four cars is shown below:
Car
A
B
C
D
Speed (in km/h)
60.34
60.32
60.33
60.35

If the speedometer can only measure to the nearest tenth of a second, which car will have a different measurement?
A. Car A
B. Car B
C. Car C
D. Car D ***

A bulldozer is rented at $800 per day plus a charge per hour of use. The bulldozer was used for 5 hours on a day, and the total charge was $3000. Which equation can be used to find the charge x, in dollars, per hour of use?
A. 800 + 5x = 3000 ***
B. 800x + 5 = 3000
C. 800x + 5x = 3000
D. 800 + 5 = 3000x

Answer 1

Which of the following is the most appropriate unit to describe the rate at which data is transferred using the internet?
===========================
Time needed is a function of megabits of data. D yes
==========================

2 + (x + y) = (2 + x) + y is an example of which algebraic property?
A. Distributive Property
B. Associative Property of Addition
C. Commutative Property of Addition ***
D. Symmetric Property
============
No http://www.mathsisfun.com/definitions/associative-law.html
===========

Which of the following best represents the average rate at which the human hair grows?
A. 0.25inches per second
B. 0.25 meters per hour
C. 0.25meter per month
D. 0.25 inches per month ***
===========
reasonable for a human :)
=============

Charles wants to determine which car is the fastest. The actual speed of four cars is shown below:
Car
A
B
C
D
Speed (in km/h)
60.34
60.32
60.33
60.35

If the speedometer can only measure to the nearest tenth of a second, which car will have a different measurement?
A. Car A
B. Car B
C. Car C
D. Car D ***
============
yes, 60.4
============

A bulldozer is rented at $800 per day plus a charge per hour of use. The bulldozer was used for 5 hours on a day, and the total charge was $3000. Which equation can be used to find the charge x, in dollars, per hour of use?
A. 800 + 5x = 3000 ***
B. 800x + 5 = 3000
C. 800x + 5x = 3000
D. 800 + 5 = 3000x
================
yes
================

Answer 2

.25 inches per hour

Answer 3

1.D

Answer 4

1.b
2.a
3.c
4.a
5.a
6.c
7.a
8.b
9.a