Answer:
-16
Step-by-step explanation:
Negative four to the second power is equal to -4 x -4 which is -16
Answer:23
Step-by-step explanation:
92/4
Since we are given with the three sides of the triangle and asked to determine the angle, we can use the cosine law.
<h2>
Answer with explanation:</h2>
Let p be the proportion of the correct answers.
As per given , we have

, since the alternative hypothesis is right tailed , so the test is a one -tailed test.
If the student gets 52 answers correct out of 80.
i.e. the proportion of correct answers : 
Test statistic : 

P-value :
[ by using p-value table for z (right-tailed)]
Since the p-value(0.0037) is less than the significance level (0.05), so we reject the null hypothesis.
Results : We have enough evidence to support the claim that a student knows more than half of the answers and is not just guessing.