Task1:
data={{-5,61},{-4,49},{-3,32},{-2,28},{-1,12},{0,5},{1,8},{2,3},{3,-4},{4,1},{5,1},{6,13},{7,17},{8,22},{9,33},{10,46},{11,63}};
a/ Generate ListPlot of the data, set AxesLabel, points should be Red, PointSize[0.02] (2 points)
b/ Using Fit find quadratic fit of the data in form of a*(x^2)+b*x+c    and display the result using Print in form like “fit= 0.25*(x^2)+3x+5.6”(2points)
c/Generate Plot of the fit for xϵ<-5,11>, the colour should be blue (1 point)
d/ Using Interpolation define a function interpolatig the data, InterpolationOrder should be 2 (1 point)
e/ Generate Plot of the interpolatin function for xϵ<-5,11>, the colour should be black (1 point)
f/ Show all the plots together with Automatic GridLines(1 point)

Task2:
Using Manipulate show PolarPlot[Sin[n*t+fi] for t∈<-Pi,Pi>, manipulators are fi (continuous, fiϵ<-Pi,Pi>) and n (discrete, nϵ{1,3,5,7,9}).
PlotStyle should be Thick, PlotRange should be {{-1,1},{-1,1}}.
(4 points)

Task 3:
data={{1,4,77},{2,5,100},{3,6,116},{4,7,143},{5,8,156},{6,9,176},{7,10,204},{8,11,222},{9,12,236},{10,13,260}}.
The term of data means {k,k-th current,k-th voltage}, i.e. {k,(Subscript[i, k]),(Subscript[u, k])}
a/ generate list {k,((Subscript[u, k])/(Subscript[i, k]))} and show it using ListPlot. Points in the ListPlot should be Joined and AxesOrigin of the ListPlot should be {1,0} (3 points).
b/Evaluate Mean value of {((Subscript[u, k])/(Subscript[i, k]))} and use Print for display it in form like “mean value 1st type = 19.8316” (2 points)
c/Evaluate  value ((Mean[(Subscript[u, k])])/(Mean[(Subscript[i, k])])) and use Print for display it in form like “mean value 2nd type = 19.8316” (2 points)

Task4
a/Using FindRoot solve simultaneous equations x+y=Cos[2x]+Sin[2y], x-y=Cos[x]+Sin[y] with starting values xstart=ystart=0. (2 point)
b/ Using Print  display the result in form like x=0.430083  y=-0.240581 (1point)

Task 5
Using Calendar package (<<Calendar`) and DateList define a function of parameter {year,month,day} that returns DaysBetween the date defined by the parameter and actual day. (3 points)