Which of the following is an example of a closed system? A estuary where fresh and ocean water mix
A chemical reaction within deep ocean organisms allowing them to glow
A living single-celled organism such as a phytoplankton
A river that flows into the ocean

Find the greatest common factor of the polynomial: 10x^5+15x^4-25x^3 10x^5 x^3 5x^3 5

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion