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never [62]
3 years ago
14

A deep sea diving bell is being lowered at a constant rate. After 12 minutes, the bell is at a depth of 600 ft. After 30 minutes

the bell is at a depth of 1900 ft. What is the average rate of lowering per minute? Round to the nearest hundredth as needed.
A. 72.22 ft per minute
B. 43.33 ft per minute
C.0.01 ft per minute
D. 63.33 ft per minute
Mathematics
2 answers:
timurjin [86]3 years ago
5 0

D. 63.33 ft per minute the deep diving bell

Masteriza [31]3 years ago
4 0

The answer is D i think

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vladimir1956 [14]

Answer:

11) r=4

12) z_3+z_1=A

13a) \bar z_1=3-2i and \bar z_2=-5+3i

13b)  \bar {z_1z_2}=-9-19i

Step-by-step explanation:

11. The given equation in rectangular coordinates is x^2+y^2=16

To convert to polar form, use the relation x^2+y^2=r^2

This implies that:

\implies r^2=16

r=\sqrt{16}

r=4

In polar coordinates, r=4 is a circle with radius 4 units.

12.  From the diagram;

z_3=-3-3i

z_2=1+i

z_1=4+i

A=1-2i

We can see that two arrows are moving in anticlockwise direction to meet A which is moving in the clockwise direction;

\implies (-3-3i)+(4+i)=1-2i

\therefore z_3+z_1=A

13. The conjugate of the complex number: z=a+bi is \bar z=a-bi

Part a) The given complex numbers are:

z_1=3+2i and z_2=-5-3i

The conjugates of these complex numbers are:

\bar z_1=3-2i and \bar z_2=-5+3i

Part b) The product of z_1=3+2i and z_2=-5-3i is

z_1z_2=(3+2i)(-5-3i)

z_1z_2=-15-9i-10i-6i^2

z_1z_2=-9-19i

The conjugate of the product is:

\bar {z_1z_2}=-9-19i

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What can you conclude from the information in the diagram
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Answer:

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Step-by-step explanation:

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Step-by-step explanation:


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bezimeni [28]

Answer:

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