Answer:
1:4
Step-by-step explanation:
4 ÷ 4 = 1
16 ÷ 4 = 4
4:16 ratio simplified is 1:4
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>
6/8 is equivalent to 3/4, and 3/4=.75, and .75/100=75 percent. So yes, it is.
Answer:
20
Step-by-step explanation:
the number line is patterned in twos, so the dot will be at 20, since its 4 spaces away from 12