A bone fragment was found from an elk which had died 40 years before. What percent of Pb-210 remains? The half-life if Pb-210 is 22 years.

they are simplified

step-by-step explanation:

answer: 1 + 1 = 11

step-by-step explanation:

answer: bea's uncle is 25 years old.

step-by-step explanation:

given the equation , we can say that the variable "x" represents the age of bea's uncle. then to find his age, we need to solve for "x":

we must add 15 to both sides of the equation:

now we need to divide both sides of the equation by 3:

therefore, we can conclude that bea's uncle is 25 years old.

x:       y:  

-1         4

0         4

1         6

2         18

3         20