PLEASE HELP M A radioactive substance starts with 3400 pounds of substance. It decays at a rate of 35.6% each year.

Showing all work, find how much of the substance is left after 13 years?

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?

Aline has a slope of and a y-intercept of –2. what is the x-intercept of the line?

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?