This is an easy half-life problem.
Every half-life, a substance loses half its radioactivity. So, after 2 half-lives, a substance will have a quarter of its radioactivity.
2 * 5,700 = 11,400 years
answer is C
<h3>
Answer:</h3>
- 3,8 kg
- 750 g
- 7,47 g
<h3>
Step-by-step explanation:</h3><h3>3800 g => kg</h3>
(3800 ÷ 1000) kg
= 3,8 kg
<h3>
¾ kg => g</h3>
(3 ÷ 4)kg × 1000
= 0.75 × 1000
= 750 g
<h3>7470 g => kg</h3>
(7470 ÷ 1000) kg
= 7,47 kg


Step-by-step explanation:
cold =25
large=5

divide it
