Answer:
20
Step-by-step explanation:
If for is four then x-4=8
thus would make x 12
Nearest ten=130
nearest one=129
nearest tenth= 129.4
nearest hundredth= 129.39
Answer:

Step-by-step explanation:
The decay rate of a radioactive isotope (also called activity of the isotope) is given by:

where
r is the decay rate
k is the decay constant
N is the number of nuclei in the radioactive sample
The decay constant of a radioactive isotope is also related to the half-life of the isotope by the formula

where
is the half-life of the isotope, which is the time taken for the sample to halve, compared to its initial amount
In this problem, the half-life of plutioniun-239 is

Therefore, the k-factor (decay constant) is:

Answer:
The x-intercept is 5 and the y-intercept is 20. To find the x-intercept plug in y = 0 into the equation and then solve for y and to find the y-intercept plug in x = 0 into the equation and solve for y.