1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
alexandr1967 [171]
3 years ago
9

The correct answer is letter E, but I am not sure how to approach this problem and I was wondering if anyone can offer any guida

nce.

Mathematics
1 answer:
Jobisdone [24]3 years ago
6 0

Explanation:

The key to area in polar coordinates is the formula for the area of a sector:

  a = (1/2)r²θ

Then a differential of area* can be written as ...

  da = (1/2)r²·dθ

Filling in the given function for r, we have ...

  da = (1/2)(4cos(3θ))²·dθ = 8cos(3θ)²·dθ

The integral will have limits corresponding to the range of values of θ for one loop of the graph: -π/6 to π/6. So, the area is ...

  \displaystyle A=\int{da}=\int\limits_{-\pi /6}^{\pi /6}{8\cos{(3\theta)}^2}\, d\theta\\\\=8\int\limits_{-\pi /6}^{\pi /6}{\cos{(3\theta)}^2}

_____

* As with other approaches to finding area (horizontal or vertical slice, for example), we assume that the differential element dθ is sufficiently small that we need not concern ourselves with the fact that r is a function of θ.

You might be interested in
Spencer surveyed five of his friends to find out how many pets they have. His results are shown in the table below. What is the
Naily [24]

Answer:

6 pets

Step-by-step explanation:

5 0
3 years ago
FOR BRAINLIEST PLEASE HELP!!!!!!!
fiasKO [112]
I think it's C. drawing a king from a deck
3 0
3 years ago
X/z+y^2-x evaluate where x=-2 y=4 and z=16
lozanna [386]

Answer:

Solution

X=-2

y=4

z=16

then,

-2/16+16×16--2

=257.875

4 0
2 years ago
Fourteen percent of the town’s population is over the age of 65. If there are 320 residents over the age of 65, approximately wh
Klio2033 [76]

Answer:

2286

Step-by-step explanation:

320 \div 1\% = 2286

8 0
2 years ago
Question 1
AveGali [126]

Answer:

2.30/7.5

Step-by-step explanation:

4.30-2=2:30

2.5-10=7.5

8 0
3 years ago
Other questions:
  • A number cube numbered 1 -6 is rolled once .
    5·1 answer
  • A large truck is going down a hill at 60 miles per hour. The driver needs to begin slowing down by shifting the gears. The speed
    10·1 answer
  • Which weighs more 5 ounces or 150 grams
    11·2 answers
  • Find the cosine ratio of angle Θ. Clue: Use the slash symbol ( / ) to represent the fraction bar, and enter the fraction with no
    9·1 answer
  • I need help asap please
    8·2 answers
  • Decide whether Rolle's Theorem can be applied to f(x) = x2 + 5 on the interval [0, 3]. If Rolle's Theorem can be applied, find a
    9·1 answer
  • In 2007, the first iPhone was priced at $599. Today the iPhone 11 is priced at $999 . What is the percent change in the cost.
    5·1 answer
  • I need to write it in numbers please
    15·2 answers
  • Find Use proportion<br> 24 =18/15<br> 21<br> b<br> 18<br> 20<br> 16
    11·1 answer
  • Tatiana starts with $8 in her piggy bank and saves $2 per week. Julian starts with $0 in his piggy bank and saves $4 per week.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!