Question 1056037
a) Yes but since the function is non-linear, you'll need more points.
You can also use an online graphing utility.
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*[illustration lp996.JPG].
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b) You could then plot a line at {{{y=28}}} and find the corresponding {{{x}}} value. This graphing utility will do it automatically to three decimal places.
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c) Yes you can solve the equation,
{{{28=60(1/2)^(x/30)+20}}}
{{{60(1/2)^(x/30)=8}}}
{{{(1/2)^(x/30)=2/15}}}
{{{x/30=log(1/2,(2/15))}}}
{{{x/30=log((2/15))/log((1/2))}}}
{{{x=30*(log((2/15))/log((1/2)))}}}
Now you can use your calculator.