Compute the Energy of the signal

[nightworrier]

tr(0.1t-3)
tr(0.2t-3)
p((t-5)/4)
compute the energy?


As far as i know,
i tried to plot the functions and calculate the area under the triangle. but i am not sure that i find the correct answer. Could you let me be sure about the answers?

My answers
1st-->5
2nd-->2.5
3rd-->4

 

[xcvxcvvc]

energy of a signal is the integral from negative infinity to positive infinity of the absolute value of the function squared.