To express the relationship between the number of questions answered correctly and the score on the test, we can establish a function. Since each correctly answered question is worth 3 points, the function \( V(x) \) can be defined as follows:
\[ V(x) = 3x \]
Where:
- \( V(x) \) is the score on the test,
- \( x \) is the number of questions answered correctly.
Now, if we want to calculate the score when 21 questions are answered correctly:
\[ V(21) = 3 \times 21 = 63 \]
Thus, to complete your statement:
- A function relating these variables is \( V(x) = 3x \).
- So \( V(21) = 63 \), meaning if 21 questions are answered correctly, Mila will score 63 points on the test.