Question 2

24

To evaluate the expression 20 - y/5 + y when y = -4, we substitute -4 into the expression, resulting in 20 - (-4)/5 + (-4). This simplifies to 20 + 0.8 - 4, which equals 24.

A) -6

This option is incorrect because substituting y = -4 into the expression does not yield a result close to -6. The calculation shows that the expression evaluates to a positive number, not a negative one.

B) 6

Choosing 6 is incorrect as well. The evaluation of the expression with y = -4 results in a value that is significantly higher than 6, indicating that this option does not reflect the correct outcome of the computation.

C) 12

This option is incorrect as well. When we evaluate the expression using y = -4, the result is much greater than 12. Therefore, 12 does not represent the correct evaluation of the expression.

D) 24

This option is correct. Substituting -4 for y in the expression yields 20 - (-4)/5 + (-4) = 20 + 0.8 - 4, which simplifies to 24, confirming that this is the right answer.

Conclusion

The evaluation of the expression with y = -4 clearly leads to the result of 24, making option D the definitive correct answer. Other options are incorrect as they do not match the calculated outcome when substituting the given value of y into the expression.