A chemist measures 8 grams of a substance that

has a half-life of 6 hours. Which equation models

the weight, y, of the substance after 15 hours?

Where b is the decay rate for this case. Using the condition given we have:

And our model would be given by:

And replacing the value of t=15 we got:

Step-by-step explanation:

For this case since the half life is 6 hours we have the following condition:

Where is the initial amount

Our model for this case is given by this expression:

Where b is the decay rate for this case. Using the condition given we have:

And solving for b we got:

And solving for b we got:

And our model would be given by:

And replacing the value of t=15 we got:

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.

need more detail

step-by-step explanation:

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