Question 177474
The formula for impedance Z is given by, 
{{{Z=sqrt(R^2+(X[l]-X[c])^2)}}}
{{{Z=sqrt(3.7^2+(5.97-7.9)^2)}}}
{{{Z=sqrt(13.69+3.7249)}}}
{{{Z=sqrt(17.4149)}}}
{{{Z=4.17}}}
The impedance is 4.17 ohms. 
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The phase angle {{{alpha}}} is given by,
{{{tan(alpha)=(X[l]-X[c])/R}}}
{{{tan(alpha)=(-1.93/3.7)}}}
{{{tan(alpha)=-0.522}}}
{{{alpha=-27.5}}} 
Voltage lags current by 27.5 degrees.