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ddd [48]
3 years ago
6

A surveyor determines that the angle of elevation between herself and the top of an observation tower is . She determines that t

he distance between her position and the base of the tower is 20 meters. Approximately how tall is the tower?
A.
11.5 meters
B.
34.6 meters
C.
40.0 meters
D.
10.0 meters
Mathematics
1 answer:
ASHA 777 [7]3 years ago
5 0

Answer:

b

Step-by-step explanation:

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How can you graph m(x)=5x and then compare it to f(x)=x?
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The prism has a surface area of 1312 mm2.
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6 0
2 years ago
Read 2 more answers
A certain substance doubles its volume every minute at 9 AM a small amount is placed in a container ,at 10 AM the container was
Y_Kistochka [10]

Answer:

the container is 1/4 full at 9:58 AM

Step-by-step explanation:

since the volume doubles every minute , the formula for calculating the volume V at any time t is

V(t)=V₀*2^-t , where t is in minutes back from 10 AM and V₀= container volume

thus for t=1 min (9:59 AM) the volume is V₁=V₀/2 (half of the initial one) , for t=2 (9:58 AM) is V₂=V₁/2=V₀/4  ...

therefore when the container is 1/4 full the volume is V=V₀/4 , thus replacing in the equation we obtain

V=V₀*2^-t

V₀/4 = V₀*2^-t

1/4 = 2^-t

appling logarithms

ln (1/4) = -t* ln 2

t = - ln (1/4)/ln 2 = ln 4 /ln 2 = 2*ln 2 / ln 2 = 2

thus t=2 min before 10 AM → 9:58 AM

therefore the container is 1/4 full at 9:58 AM

8 0
2 years ago
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