## THIS USER ASKED 👇

**Which of the following represents the zeros of f(x) = 3×3 − 10×2 − 81x + 28? (2 points)**

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**Select one:
a. 7, −4,1 over 3
b. 7, −4, −1 over 3
c. 7, 4, 1 over 3
d. 7, 4, −1 over 3**

## THIS IS THE BEST ANSWER 👇

step by step explanation:

the original amount is only the time it takes to trace 1/2 of our substance

(1/2) =) construct ln both sides

ln (1/2) =) and we can write

ln (1/2) =) lne and lne = 1 so we have

ln (1/2) = -.1092t divide both sides by -.1092

t = ln (1/2) / -. 1092 = approximately 6.347 days = approximately 6.3 days (rounded)