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
Agata [3.3K]
3 years ago
5

Sorry for the spam, I just really need help.

Mathematics
1 answer:
zloy xaker [14]3 years ago
3 0
13 is C and 14 is b
You might be interested in
) The density of oil in a circular oil slick on the surface of the ocean at a distance of r meters from the center of the slick
Feliz [49]

Answer:

Therefore the mass of the of the oil is 409.59 kg.

Step-by-step explanation:

Let us consider a circular disk. The inner radius of the disk be r and the outer diameter of the disk be (r+Δr).

The area of the disk

=The area of the outer circle - The area of the inner circle

= \pi (r+\triangle r)^2- \pi r^2

=\pi [r^2+2r\triangle r+(\triangle r)^2-r^2]

=\pi [2r\triangle r+(\triangle r)^2]

Since (Δr)² is very small, So it is ignorable.

∴A=2\pi r\triangle r

The density \delta (r)= \frac{40}{1+r^2}

We know,

Mass= Area× density

        =(2r \pi \triangle r)(\frac{40}{1+r^2}})

Total mass M=\sum_{i=1}^n \frac{80r_i\pi }{1+r^2}\triangle r_i

Therefore

\sum_{i=1}^n \frac{80r_i\pi }{1+r^2}\triangle r_i=\int_0^5 \frac{80r\pi }{1+r^2}dr

                      =40\pi[ln(1+r^2)]_0^5

                      =40\pi [ln(1+5^2)-ln(1+0^2)]

                     =40\pi ln(26)

                     = 409.59 kg (approx)

Therefore the mass of the of the oil is 409.59 kg.

3 0
3 years ago
PLEASE HELP!! 50 POINTS!!!!!
OLEGan [10]

Answer:

3\2 is the marked

y cos x,=2

3\2=0.5

x=0.5*2=3.0

=3.0*2=6.0

6 0
2 years ago
What’s A third of a number 9
lapo4ka [179]
Threeeeeeeeeeeeeeeeeeeeeeeeee
8 0
3 years ago
Read 2 more answers
Help asap pleaseeeee
Marrrta [24]

Answer:

5 units.

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Harry got 42 out of 49 correct in his test.
Ymorist [56]

Answer:

42/49 is the fraction

Step-by-step explanation:

you can't simplify so put the amount correct over the amount total.

7 0
3 years ago
Read 2 more answers
Other questions:
  • Convert pounds to ounces 12.6 pounds
    12·2 answers
  • Write 1,700 in exponential form
    9·2 answers
  • Please helpppp As soon as possible
    7·1 answer
  • 1/216 using negative exponents
    10·1 answer
  • I can make 6 pancakes with 2 eggs, 1 1/2 cup milk and 1/3 cup pancake mix. If I have five eggs, 1 1/2 cups pancake mix, and 2 pi
    5·1 answer
  • Brainlist <br> Translate the phrase into an algebraic expression.<br> The sum of c and 2
    14·2 answers
  • In a seventh grade class, 14 out of 30 students are boys. In simplest terms, what is the ratio of the number of boys to the numb
    6·2 answers
  • HELP!
    7·2 answers
  • 2500 principal earning 4%, compounded quarterly, after 4 years.
    6·1 answer
  • Module 1: directions: respond to this question to demonstrate your understanding of the topic/content. be sure to provide adequa
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!