Which of the following tools should a scientist use to measure an object in milligrams?
a. graduated cylinder
b. pan balance
c. tape measure
d. thermometer

The answer for this item would be letter "B. Pan balance". Each of the items from the choices serves different purposes. The graduated cylinder is used to measure liquid volumes. Tape measure is used for measuring lengths and the thermometer is used for measuring temperature.

B. Pan balance

Step-by-step explanation:

Which of the following tools should a scientist use to measure an object in milligrams?

The answer is : B. Pan balance

A pan balance is a device for weighing.

This device has 2 pans on a balanced beam. When these pans contain exactly the same mass the beam is in balance.

Other devices do not measure objects in milligrams.

Problem: The highest elevation in North America is Mt. McKinley, which is 20,320 feet above sea level. The lowest elevation is Death Valley, which is 282 feet below sea level. What is the distance from the top of Mt. McKinley to the bottom of Death Valley?

Solution: The distance from the top of Mt. McKinley to sea level is 20,320 feet and the distance from sea level to the bottom of Death Valley is 282 feet. The total distance is the sum of 20,320 and 282, which is 20,602 feet.

The problem above uses the notion of opposites: Above sea level is the opposite of below sea level. Here are some more examples of opposites:

top, bottom  |  increase, decrease  |  forward, backward  |  positive, negative

We could solve the problem above using integers. Integers are the set of whole numbers and their opposites. The number line is used to represent integers.

Step-by-step explanation: