Answer:
b
Step-by-step explanation:
X = sqrt( 4 *(8+4))
x= sqrt(4*12)
x = sqrt(48)
x = 6.928 ( Round the answer as needed)
8 divided by 1 4/5 is 4 4/9
Answer:
2%
Step-by-step explanation:
20% takes 10 years to decay
To find per year decay, we divide the percentage by the number of years, so we get unit rate of years {per year]. Thus we have:
20%/10 = 2% per year
It's that simple.
Hence, the percentage by which the substance decays each year is 2%
