A particular substance decays from 500 mg to 100 mg in 180 years. If the decay is exponential, what is the half-life of the substance

what's the

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2

answer; capital earns interest; entrepreneurship receives a profit or incurs a loss;

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.