A- 13 B- 26 C- 52 D- there is not enough information
1 answer:
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Answer:
53 meters
Step-by-step explanation:
The angle between a viewer's horizontal line of sight and the line of sight down towards a particle is called the angle of depression. For example if a viewer is sitting at the top of a tower and looking down on a car, the angle between the viewer's horizontal line of sight and the line of sight to which he looks at the car is the angle of depression.
A sketch of the positions of the boats and the tower has been attached to this response.
As shown,
the distance between the two boats A and B is marked x meters.
the horizontal distance between boat A and the foot of the tower is y meters.
the horizontal distance between boat A and the foot of the tower is x + y meters.
the height of the tower is 60 meters.
the angle of depression of boat A is 28°
the angle of depression of boat B is 45°
To find the value of y, from triangle DBC we use the trigonometric ratio for tangent. i.e
tan 45° =
1 =
y = 60 meters
To find the value of x, from triangle ABC we use the trigonometric ratio for tangent. i.e
tan 28° =
<em>Where y = 60 meters</em>
tan 28° =
0.5317 =
x + 60 =
x + 60 = 112.85
x = 112.85 - 60
x = 52.85 meters
Therefore, boat A is about 53 meters from boat B
There is 150% increase in the number of volunteers.
Step-by-step explanation:
Given,
Old number of volunteers = 20
New number of volunteers = 50
Change = New value - Old value
Change = 50 - 20 = +30
The positive sign indicates the increase.
Percent increase =
There is 150% increase in the number of volunteers.
Keywords: percentage, subtraction
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