Answer:
Sandra's final score is [tex]-5\frac{1}{4}[/tex].
Step-by-step explanation:
It is provided that each question Sandra answers incorrectly changes her overall score by -3/4 points.
That is, for every incorrect answer Sandra looses 3/4 points.
At a moment Sandra's overall score was [tex]-4\frac{1}{2}[/tex] points.
And then she answered the last questions incorrectly.
Compute the final score as follows:
Final score = Sandra's overall score - [tex]\frac{3}{4}[/tex]
[tex]=-4\frac{1}{2}-\frac{3}{4}\\\\=-\frac{9}{2}-\frac{3}{4}\\\\=\frac{-18-3}{4}\\\\=-\frac{21}{4}\\\\=-5\frac{1}{4}[/tex]
Thus, Sandra's final score is [tex]-5\frac{1}{4}[/tex].
