Answer:
The individuals are observed the exact way they act in real life.
Step-by-step explanation:
There are two main types of studies in research; one is controlled or experimental and the other is observational.
In observational studies, the individuals participating in study are not manipulated or intervened or controlled in any way by the researcher.
Hence the statements best describes a characteristic of an observational study is the individuals are observed the exact way they act in real life !
First, we imagine a right triangle. Second, we are given that the building is 62 feet tall. Since the height of building is vertical straight - that means the height is opposite side of triangle. It also casts a shadow 21 meters long. Shadow should be the adjacent side because it casts on the ground and not on the air.
If we imagine the right triangle + the problem in our head, we'd get the triangle that the opposite side is 62 feet tall and the adjacent side is 21 meters long.
Use the tangent ratio to find the angle of sun shining.

Substitute adjacent = 21 and opposite = 62 in the ratio.

For this part, you might need a calculator or trigonometric table because some values cannot be exactly found.
From the equation, we should get 71.288 which we round the answer to nearest hundreth and the answer would be 71.29
Answer
The solution of this equation is 16/15
Let x represent months
40 + 50x = 190 + 40x
Subtract 45 from both sides
40 + 10x = 190
Subtract 40 from both sides
10x = 150
Divide 10 by both sides and x = 15 months
Plug back in the 15 months for x
40 + 50(15)= $790
Using the formula a(b+c) = ab + ac, then 7(2x-6) = 14x - 42. The answer is D.