Question Detalls A certain radioactive isotope has a half life of 5 years. If
you start off with a sample of 100 g, how much would
be left in 18 years? Round your answer to the nearest
thousandths place (3 decimals).
Write the equation you used in the "Show Your Work"

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

i pretty sure it is

provide more details to solve it

step-by-step explanation: