Answer:
It will take 15.029 years for element X to reach mass of 260 grams
Step-by-step explanation:
The half life period of radioactive element X is 26 years
The initial mass of radioactive element X is 260 grams
Elapsed time = half life * log (beginning amount /ending amount)/log 2
Substituting the given values, we get
Elapsed time = 26 * log (390/260)/log 2
= 15.209 years
Multiplying two negative numbers would always give you a positive product
Example 1) -2 * -1 = 2
Example 2) -5 * -4 = 20
Example 3) -10 * -3 = 30
Answer:
13200
Step-by-step explanation:
$1200:100ft
?:1100 ft
1. 1100/100 = 11
1200*11 = $13200
2. 1100(1200)=100?
1320000/100=?
?=13200
