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
Sphinxa [80]
3 years ago
8

A stone is dropped into a lake, creating a circular ripple that travels outward at a speed of 40 cm/s. Find the rate at which th

e area within the circle is increasing after each of the following.
after 1 s = after 3 s = after 7 s =
Mathematics
1 answer:
Sonja [21]3 years ago
5 0
Given : dr/dt = 40 cm/s A = πr^2 dA/dt = 2π r dr/dt case 1: when s = 1, r = 40 dA/dt = 2π(40)(40) = 3200π cm^2/sec case 2: when s = 3, r = 3(4) = 120 cm dA/dt = 2π(120)(40) = 9600π cm^2/sec case 3: ... your turn .....
You might be interested in
Am not sure if I started this right, but it's probability, can someone check if I started right?
Sphinxa [80]
Yup! You got it so far! Keep it up! <3
6 0
3 years ago
What is the height of this isosceles triangle?
erastova [34]

Answer:

height ≈ 11.9 units

Step-by-step explanation:

Construct a perpendicular bisector from the vertex to the base, thus splitting the triangle into 2 right triangles.

Using the sine ratio in one of these right triangles, then

sin48° = \frac{opposite}{hypotenuse} ( the opposite is the height h )

sin48° = \frac{h}{16} ( multiply both sides by 16 )

16 × sin48° = h , thus

h ≈ 11.9 ( to the nearest tenth )

5 0
3 years ago
Rewrite the radical in exponential form
Kamila [148]

\sqrt[4]{10v}    = \sqrt[4]{10}  \times  \sqrt[4]{v}
4 0
3 years ago
Help solve the following equation: 20.6 + 2.1x = -8.2x
Igoryamba
20.6 + 2.1x = -8.2x

20.6=-10.3x

-2=x
4 0
3 years ago
Read 2 more answers
30 pts ! The height of the Ferris wheel in feet can be represented by the function 50 cos (π/15(x-10))+52 with time in x seconds
Dahasolnce [82]

h = 50 cos ( pie(x - 10 )/15 ) + 52

80 = 50 cos ( pie( x - 10 )/15 ) + 52

80 - 52 = 50 cos ( pie( x - 10 )/15 )

28 = 50 cos ( pie( x - 10 )/15 )

cos ( pie( x - 10 )/15 ) = 28/50

cos ( pie( x - 10 )/15 ) = 56/100

cos ( pie( x - 10 )/15 ) = cos ( 56 )

cos ( pie( x - 10 )/15 ) = cos ( 0.3111 pie )

Thus ;

pie( x - 10 )/15 = 0.3111 pie

( x - 10 )/15 = 0.3111

x - 10 = 15 × 0.3111

x - 10 = 4.6665

x = 10 + 4.6665

x = 14.6665 [ approximately ]

Thus the correct answer is exactly what u chose goodjob .....

7 0
2 years ago
Other questions:
  • What is 17/12 as a mixed number
    8·2 answers
  • 25 is what percent of 37
    12·2 answers
  • Which relation is a function
    8·2 answers
  • What do the numbers represent in a linear equation in slope-intercept<br>form? ​
    15·1 answer
  • Can someone help me with geometry ?? &lt;3
    9·1 answer
  • How many times can you round 72,586
    14·2 answers
  • I invested in a savings bond for two years and paid simple interest at an annual rate of 6%. The total interest I earned was $48
    7·1 answer
  • All freshmen, sophomores, juniors, and seniors attended a high school assembly. The total student attendance is shown in the tab
    6·2 answers
  • James had 568 books to put into 9 boxes. How many boxes were in each box ?Where there any book left that needs another box?
    5·1 answer
  • 6x+9=45 how do you solve it
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!