Which equation represents the polar form of x2 + (y + 4)2 = 16?

Answers

Answer 1
Answer:

The polar form of equation is r = -8sinθ.

What is polar form of complex number?

The combination of the complex number's modulus r and argument  is how complex numbers are shown in polar form z = r cosθ + i r sinθ = r (cosθ + i sinθ), is the polar form of a complex number with coordinates (x, y). In the coordinate system, polar coordinates of real and imaginary numbers are used to represent the polar form.

Given x² + (y + 4)² = 16

here The following is the relationship between (r, θ) and (x, y) if they are in Cartesian form:

x = rcosθ, y = rsinθ and r² = x² + y² ad tanθ = y/x

x² + (y + 4)² = 16

x² + y² + 16 + 8y = 16

x² + y² + 8y = 0

r² + 8rsinθ = 0

r(r + 8sinθ) = 0

r =0 and r = -8sinθ

Hence the polar form of equation is  r = -8sinθ.

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Answer 2
Answer:

Answer:

c. r=-8sin(theta)

Step-by-step explanation:

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About 70,000 people live in a 6-mile radius of a city's town hall. Find the population density in people per square mile. Round your answer to the nearest whole number.The population density is about _
people per square mile.

Answers

Answer:

The population density is 618.93 per square mile.

Step-by-step explanation:

It is given that,

No. of people, N = 70,000

The radius of a city's town hall, r = 6 miles

We need to find the population density. It can be calculated by the formula i.e. number of people divided by area of land such that,

P=(N)/(A)\n\nP=(N)/(\pi r^2)\n\nP=(70000)/(\pi (6)^2)\n\nP=618.93\ \text{per square mile}

So, the population density is 618.93 per square mile.

What is a Scalene triangle?

Answers

Answer:

Atrianglethathasnoequalsidesisascalenetriangle.

16+10/5-3*2=12 true or false.

Answers

We need to follow the order of operations to get this one right. 
16 + (10/5) - (3*2)
16 + (2) - (6)
16 + 2 - 6
18 - 6
12Your answer is true!

You can run 10 miles in 80 minutes. How far can you run in 2.5 hours?

Answers

Answer:

18.75 miles

Step-by-step explanation:

1 hour = 60 minutes

2.5 Hours = 150 minutes

10 miles _____> 80 minutes

x_______> 150 minutes

x= ( 150 * 10) / 80

= 1500/80

x= 18.75 miles

easy

Answer:

Step-by-step explanation:

10 miles- 80 minutes

            ?- 150 minutes

1500+80x

X= 10.75 miles

Which point represents the value of –(–2) on the number line?

Answers

Answer:

Step-by-step explanation:

2

2 minus signs multiplied together give a plus. The number line I'm using does not have any y values.

Answer:

-2

Step-by-step explanation:

Sharon and Dani make invitations for a party.Sharon makes 27 invitations. That is 3 times as many as Dani makes.write and solve an equation to find the number of invitations Dani makes

Answers

Answer:

81 Invitations, 27 times 3 = 81

Step-by-step explanation: