document.write( "Question 204501: I would like to know if I did these questions right. \n" );
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document.write( "For the first one I have this: \n" );
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document.write( "Do exponential functions only model phenomena that grow, or can they also model phenomena that decay? \r \n" );
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document.write( "Explain what is different in the form of the function in each case. \r \n" );
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document.write( "Yes they also model decay, for example you can use them to model the decay of radioactivity. The only difference is that there will be a negative index. \n" );
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document.write( "Example of function of growth: y = ae^(kt) \n" );
document.write( "Example of function of decay: y = ae^(-kt) \n" );
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document.write( "And for the second one I have: \n" );
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document.write( "A cell divides into two identical copies every 4 minutes. How many cells will exist after 5 hours? \r \n" );
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document.write( "f(t) = 2^(t/4) \n" );
document.write( "after 5 hours: 5 * 60 = 300 \n" );
document.write( "f(t) = 2^(300/4) \n" );
document.write( "f(t) = 2^75 \n" );
document.write( "f(t) = 3.78(10^22) \n" );
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document.write( "Are these correct and if not can you please explain them to me \n" );
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