A certain radioactive substance has a half-life of about 2650 years. Write an equation describing the situation with the original quantity of the substance
being 200 milligrams. How much will remain after 500 years? In how many years
will there be half of the original left?

so far i think you have the right thing going for you just remember soh cah toh

step-by-step explanation:

sine over hypotenuse

cosine   equals adjacent

tangent over hypotenuse

49%

step-by-step explanation:

when you realize that you dont know just realize i just took a test and im so smart

x = 3 ± √(5+y)

step-by-step explanation:

*calories burned = (weight)(calorie factor)*

calories burned = 180 (0.65)

calories burned = 117

the calories he used up is 117, which is 65% of his weight.