The total work done is equal to 134 J.
The work formula is characterized as the multiplication of the force performed and the distance in which the movement was performed, so that:
[tex]W = F \times d[/tex]
Thus, it is enough to calculate the value of the work in each movement and add to find the total work, so that:
[tex]W_1 = 3 \times 28 = 84J\\W_2= 4 \times 14 = 56J\\W_3 = (-1.2) \times 5 = 6J[/tex]
[tex]84 + 56 + (-6) = 134J[/tex]
So, the total work done is equal to 134 J.
Learn mor about work in: brainly.com/question/4095205