If a radiographic substance's half-life is 20 years, how much of a 40 gram sample will be left after 60 years?

A. 5 grams

B. 10 grams

C. 20 grams

D. 30 grams

Are lines of latitude equal distances apart?

Is it possible that life exists outside of earth but within our solar system? (paragraph)

Who passed the Intolerable Acts in response to the Boston Tea Party? A. India B. colony leaders C. England

When a farmer uses no-till farming methods, this means: a. More erosion is likely to occur. b. Only organic fertilizers are used. c. Seeds are planted among the roots of the previous crop. d. The plants do not require water.

If a star is considered medium-sized, it is about the size of our sun about half the size of our sun about twice the size of our sun at least five times the size of our sun

Reasons for high informal sector employment in south africa

What is the cause of deforestation

Which of the following areas have the highest population density? A) Quebec B) United States C) California D) New York City

What are the cause and consequences of transportation

A self-employed forester who cruises timber for the public? Non-professional Consulting Forester Public Relations Bank and Credit Unions Teaching Research Government (State & Federal)