Write a two column proof for each.

A radioactive substance decays exponentially. a scientist begins with 190 milligrams of a radioactive substance. after 33 hours, 95 mg of the substance remains. how many milligrams will remain after 65 hours?

What is the least common multiple of 4,5,6

Mr. James deposits $450,000 at the end of each year for 10 years. What will be the value of his money at the end of 10 years at (a) 9%, (b) 10% and (c) 12%?

Youth tickets (y) cost $2 for a ride, while adult tickets (x) cost $3. The amount of money earned is $54. If all the seats were filled (24 seats), how many of each ticket was sold?

Do you know what 3.3 to the second power is?

Austins allowance is $15 per week. he spends $4 each week in baseball cards how much money will Austin have at the end of 12 weeks

What plus 32 equals 88

Chandler is walking one-sixteenth kilometer every 10 minutes. How many kilometers will he walk in 1 hour?

Given the box plot, will the mean or the median provide a better description of the center? box plot with min at 6, Q1 at 7.5, median at 8, Q3 at 23, max at 32.5

There are 3 men and 7 women in room a and 6 men and 3 women in room b. one random person from room a moves to room b. then a person comes out of room b. what is the probability that the person from room b is a woman?