Hello please help!
The rate at which material decays is given in the differential equation where
x is the grams present after t days.
dx/dt = -kx
The half life of a radioactive material is roughly 25 days.
find the time taken for 100g of the material to decay to 20g.
I know you intergrate the equation by swapping x over to the left to get 1/x and dt over to the right to get -kdt. and i integrated the two sides, but when i "plugged" all the numbers in, it never worked out. the answer is...58 days, please help!