Answer:
They are vertical angles
Step-by-step explanation:
they are across from each other/opposites of each other
<em>vertical angles:</em> each of the pairs of opposite angles made by two intersecting lines.
Answer: David conducted (an observational study) because (it studies human behavior) and (the sample is not manuipulated).
Step-by-step explanation:
hope this helps! (:
Okay so 51 * 35 = 1785. Now that you know that all you have to do is divide that number by 42 so , 1785/42= 42.5. So the answer is 42.5 !