Given the equation:

You know that the radioactive substance has this half-life (in years)

And:

Therefore, you can rewrite the equation in this form in order to find "k":

Solve for "k":
Answer:
=14-(7*10)
Step-by-step explanation:
fourteen = 14 (base)
less = -
PRODUCT means multiplication
PRODUCT of seven and ten = 7*10
*Don't forget parenthesis
Answer= 14 - (7*10)
Answer:
x=1/2
Step-by-step explanation:
√49 is a rational number.