document.write( "Question 193390: Please check my work, thank you.\r \n" );
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document.write( "Exponential Functions\r \n" );
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document.write( "Question 1: \n" );
document.write( "Do exponential functions only model phenomena that grow, or can they also model phenomena that decay? Explain what is different in the form of the function in each case. \n" );
document.write( "Yes, they can 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" );
document.write( "Example of function for growth: y=ae^(kt) \n" );
document.write( "Example of function for decay: y=ae^(-kt) \n" );
document.write( "Question 2: \n" );
document.write( "A Cell divides into two identical copies every 4 minutes. How many cells will exist after 5 hours? \n" );
document.write( "Growth formula: \n" );
document.write( "A(t) = A(o)(2)^(t/4) where t is number of minutes after t = 0 \n" );
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document.write( "A(300) = 1*2^(300/4) \n" );
document.write( "A(300) = 2^(75) \n" );
document.write( "A(300) = 3.77x10^22 cells \n" );
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