Tessa's cumulative GPA for all four semesters is 3.44.
To find Tessa's cumulative GPA, we first need to calculate the total number of course units she has taken. For the first three semesters, she took 46 course units. For the fourth semester, she took 12 course units. So, in total, she has taken 46 + 12 = 58 course units.
Next, we need to calculate her total grade points. To do this, we multiply her GPA for each semester by the number of course units she took in that semester, and then add up the results. For the first three semesters, her total grade points are:
3.35 x 46 = 154.1
For the fourth semester, her total grade points are:
3.74 x 12 = 44.88
So her total grade points for all four semesters are:
154.1 + 44.88 = 198.98
Finally, we divide her total grade points by the total number of course units she has taken:
198.98 / 58 = 3.44
Therefore, Tessa's cumulative GPA for all four semesters is 3.44.