B. Please do the followings,

%1

t=-5:0.01:5
subplot(9,1,1)
plot(t,u(t-1),'g')
subplot(9,1,2)
plot(t,u(2*t+4),'m')
subplot(9,1,3)
plot(t,u(3*t+1)+u(t-1)+u(t-3)-3*u(t-5),'b')
subplot(9,1,4)
plot(t,ramp(t+1),'r')
subplot(9,1,5)
plot(t,ramp(t+1)-2*ramp(t)+ramp(t-1),'r')
subplot(9,1,6)
plot(t,ramp(t+1)-2*ramp(t-4),'r')
subplot(9,1,7)
plot(t,imp(2*t-1)+imp(3*t-2)+imp(4*t+3)+imp(2*t-4),'m')
subplot(9,1,8)
plot(t,u(t-2)+imp(t-1)+u(t+4),'y')
subplot(9,1,9)
plot(t,u(t+1)+imp(t-2),'c')

%2

n = -5:0.01:5
subplot(6,1,1)
stem(n,impDT(n-2),'g')
subplot(6,1,2)
stem(n,impDT(n-2)+impDT(2*n-6)+impDT(n-2)+impDT(n-2),'m')
subplot(6,1,3)
stem(n,stepDT(n-2)-stepDT(n-5),'b')
subplot(6,1,4)
stem(n,stepDT(n-2)-impDT(n-5),'r')
subplot(6,1,5)
stem(n,impDT(n-2).*n.^2 + stepDT(n-2) +1,'c')
subplot(6,1,6)
stem(n,rampDT(n)-2*rampDT(n-2)+rampDT(n-4),'f')

-------------------------------------------------------------------------
%question1%

n=-10:0.01:10;

subplot(7,1,1)
stem(n,impDT(n-3),'g')
subplot(7,1,2)
stem(n,impDT((2*n)-2)+impDT((2*n)-6)+impDT((2*n)-10)+impDT(n-8),'y')
subplot(7,1,3)
stem(n,stepDT(n+2)-stepDT(n-5),'m')
subplot(7,1,4)
stem(n,stepDT(n+2)+impDT(n-5),'r')
subplot(7,1,5)
stem(n,(impDT(n-3).*(n.^2))+stepDT(n-4),'c')
subplot(7,1,6)
stem(n,rampDT(n)-(2*rampDT(n-2))+rampDT(n-4),'r')
subplot(7,1,7)
stem(n,rampDT(n+2)-(2*rampDT(n-2))+rampDT(n-6),'m')



%question2%


%write this in command window%
t=-10:0.01:10;

subplot(5,1,1)
plot(t,u(t-2)+imp(t-5),'g')
subplot(5,1,2)
plot(t,u(t+1)+imp(t)-u(t-3)+ramp(t-6),'m')
subplot(5,1,3)
plot(t,u(t)+u(t-1)-3*imp(t-5)+u(t-8)-3*u(t-10),'b')
subplot(5,1,4)
plot(t,ramp(t)-3*ramp(t-4)-imp(t-6)+u(t-8).*t,'r')
subplot(5,1,5)
plot(t,2*u(t+2)+u(t)+5*imp(t-3)-imp(t-5).*t.^2,'m')



%question3%
%write this function in m-file and save it as x1.m%
function y=x1(t)
y=exp(-(t.^2)).*u(t)-ramp(t).*(t.^2);

%write this function in m-file and save it as x2.m%
function y=x2(n)
y=cos(n).*u(n).*(n.^2);


%write this in command window%

t=-20:0.01:20;
n=-20:20;
subplot(2,1,1)
plot(t,x1(t),'g')
subplot(2,1,2)
stem(n,x2(n),'m')

----------------------------------------------------------
%question4%

%write this function in m-file and save it as pieceu.m%

function y=pieceu(t,epsilon)

for i=1:length(t)

    if t(i)<=(-1*epsilon)
        y(i)=0;
    elseif (-1*epsilon)<=t(i) && t(i)<=epsilon
        y(i)=(1/(2*epsilon))*t(i);
    elseif epsilon<=t(i)
        y(i)=1;
    else
        y(i)=0;
    end
    
end

%write this in command window%

t=-10:0.01:20;
plot(t,pieceu(t,epsilon))

xlabel('t values')
ylabel('x values')
title('x values versus t values')
---------------------------------------------------
%question5%

% Define the time range
t = -5:0.01:5;

% Define the signals
signal1 = ramp(-t);
signal2 = -ramp(-t-2);
signal3 = -2*u(-t-2);
signal4 = imp(t);

% Plot each signal separately
subplot(4,1,1);
plot(t, signal1, 'r');
title('Signal 1: ramp(-t)');
xlabel('Time');
ylabel('Amplitude');

subplot(4,1,2);
plot(t, signal2, 'g');
title('Signal 2: -ramp(-t-2)');
xlabel('Time');
ylabel('Amplitude');

subplot(4,1,3);
plot(t, signal3, 'b');
title('Signal 3: -2u(-t-2)');
xlabel('Time');
ylabel('Amplitude');

subplot(4,1,4);
plot(t, signal4, 'm');
title('Signal 4: imp(t)');
xlabel('Time');
ylabel('Amplitude');

% Add all the signals together
y = signal1 + signal2 + signal3 + signal4;

% Plot the combined signal
figure;
plot(t, y, 'k');
title('Combined Signal');
xlabel('Time');
ylabel('Amplitude');



%question6%

%write this in command window%

t= -20:0.01:20;

subplot(5,3,1)
plot(t,0.5*ramp(t+1),'Linewidth',3)
subplot(5,3,2)
plot(t,0.5*u(t),'Linewidth',3)
subplot(5,3,3)
plot(t,0.5*ramp(t+1)+0.5*u(t),'m','Linewidth',3)
subplot(5,3,4)
plot(t,-0.5*ramp(t),'Linewidth',3)
subplot(5,3,5)
plot(t,0.5*ramp(t+1)+0.5*u(t)-0.5*ramp(t),'m','Linewidth',3)
subplot(5,3,6)
plot(t,ramp(t-1),'Linewidth',3)
subplot(5,3,7)
plot(t,0.5*ramp(t+1)+0.5*u(t)-0.5*ramp(t)+ramp(t-1),'m','Linewidth',3)
subplot(5,3,8)
plot(t,-3*ramp(t-2),'Linewidth',3)
subplot(5,3,9)
plot(t,0.5*ramp(t+1)+0.5*u(t)-0.5*ramp(t)+ramp(t-1)-3*ramp(t-2),'m','Linewidth',3)
subplot(5,3,10)
plot(t,-0.5*u(t-2.5),'Linewidth',3)
subplot(5,3,11)
plot(t,0.5*ramp(t+1)+0.5*u(t)-0.5*ramp(t)+ramp(t-1)-3*ramp(t-2)-0.5*u(t-2.5),'m','Linewidth',3)
subplot(5,3,12)
plot(t,2*ramp(t-2.5),'Linewidth',3)
subplot(5,3,13)
plot(t,0.5*ramp(t+1)+0.5*u(t)-0.5*ramp(t)+ramp(t-1)-3*ramp(t-2)-0.5*u(t-2.5)+2*ramp(t-2.5),'m','Linewidth',3)
subplot(5,3,14)
plot(t,-0.5*u(t-4),'Linewidth',3)
subplot(5,3,15)
plot(t,0.5*ramp(t+1)+0.5*u(t)-0.5*ramp(t)+ramp(t-1)-3*ramp(t-2)-0.5*u(t-2.5)+2*ramp(t-2.5)-0.5*u(t-4),'m','Linewidth',3)




%question7%
%write this function in m-file and save it as pieceu2.m%
function y=pieceu2(t)

for i=1:length(t)

    if t(i)<=(-10)
        y(i)=sin(t(i));
    elseif (-10)<=t(i) && t(i)<=10
        y(i)=imp(t(i));
    elseif 10<=t(i)
        y(i)=u(t(i));
    else
        y(i)=0;
    end
    
end


%write this in command window%
t= -30:30;

plot(t,pieceu2(t))