Which value must be added to the expression x2 + 16x to make it a perfect-square trinomial? 8 32 64 256
2 answers:
You might be interested in
Answer:
B. 96
Step-by-step explanation:
Let x represent score of final third exam.
We have been given that in a given course a student receives preliminary examination grades of 81, 85, and 95.
Let us find average of preliminary scores.
We have been given that the final examination is weighed for one-third and the average of the preliminary grades is weighed as 2/3 of the final grade. This means that final grade is equally weighed into 3 parts. The two parts are 87 each and third part is x.
Using our given information, we can set an equation as:
Therefore, the final examination grade should be 96 for a semester average of 90.