Radium-226, a common isotope of radium, has a half-life of 1,620 years. how many grams of a 120-gram sample will remain after t years? which equation can you use to solve this problem?

Step-by-step explanation:

We have been given that Radium-226, a common isotope of radium, has a half-life of 1,620 years.

We will use half life formula to solve our given problem.  

, where,  

,

,

.

As we are told that the sample has 120 grams, this means that a equals 120. Upon substituting our given values in half life formula we will get,

Therefore, the equation represents the remaining amount of Radium-226 after t years.

The equation represents the remaining amount of Radium-226 after t years.

Given:

The half-life of a common isotope of radium (Radium-226) = 1,620 years

Initial value (a) = 120 gram

We will use the half-life formula to solve our given problem.

Where,

a = Initial value

h = Half life

t = Time

So,

Therefore, the equation represents the remaining amount of Radium-226 after t years.

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yo answer should be 6 if im not mistaken

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.