No as complementary angles add up to whisk 180 degrees, however supplementary angle would be true for this question
If you mean unit rate you find it by dividing the top number by the bottom number to fin the singular number or unit rate.
Answer: One tail test.
Step-by-step explanation:
Given : A sample of 36 observations is selected from a normal population. The sample mean is 12, and the population standard deviation is 3.
Also, The set of hypothesis to conduct a test :-

The kind of test need to perform is dependent upon the alternative hypothesis.
Since, the alternative hypothesis is one tailed (right-tailed), so the test is one tail test.
Answer:1875cm^3
Step-by-step explanation:
Volume = mass/density
15,000/8=1875
42 - -84=-42
Hope this helps :)