Answer:
BC = 1.7
Step-by-step explanation:
Since, cosine of any angle (except right angle) represents the ratio of base length and hypotenuse.
Cosθ = 
From the given right triangle ΔACB,


Cos(70°) 
BC = 5Cos(70°)
= 1.71
≈ 1.7
A)
D+Y=50
D=Y+10
b)
Y+10+Y=50
2Y+10=50
2Y=40
Y=20
Therefore there are 20 in yearbook and 30 in drama.
To check our work:
D=Y+10
30=20+10
30=30 [CHECKS TRUE]
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It is given that the mountain climber's change in elevation over an 8-hour period is −248 feet. Therefore, to find the average change in elevation per hour for that time period all that we need to do is divide the total change in elevation by the the time taken.
Therefore, average change=
feet
Therefore, the first option is the correct option.
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