Answer:
x=0.107
Step-by-step explanation:
First we distribute 13 to x and 15. That gives us 13x+15x=3. Now we add 13x and 15x, that gives us 28x=3. Now we divide by 28 on both sides. That gives us x=0.107
400cm
39.98
Explanation:
39.98015
0 < 5, so 2nd decimal stays at 8
It is B. simple random sample