Answer:
D
Step-by-step explanation:
.............................
Answer:
4/75
Step-by-step explanation:
The formula for half-life is:

A is the amount remaining, P is the initial amount, t is the time that has passed, and h is the half-life of the substance. Plug in the values that you know and solve:

Rounded to the nearest whole number, the density of the substance was about 13<span>mg / cm².</span>
Answer:
30
Step-by-step explanation:
Let's say x is the number of friends he has
4 · x = 121 - 1
4x = 120
Divide by 4 on each side
x = 30
Your answer would be C.)6. Six thousandths times one hundred is six tenths.
0.006 (six thousandths) X (times) 100(one hundred) = 0.6