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
Gre4nikov [31]
3 years ago
8

Circumference and Area of Circles

Mathematics
1 answer:
yanalaym [24]3 years ago
8 0

Step-by-step explanation:

Area of a circle = #r^2

1256 = 3.14 × r^2

r^2 = 1256/3.14

r^2 = 400

Square root of r = 20

Diameter = 2 × r = 2 × 20 = 40 inches

You might be interested in
A grocery​ store's receipts show that sunday customer purchases have a skewed distribution with a mean of ​$3030 and a standard
leva [86]

A. we use the z statistic to solve this problem

z = (x – u) / s

We calculate the value of the sample mean u and standard deviation s:

u = $30 * 304 = $9120

s = $21 * 304 = $6384

 

z = (9,600 – 9120) / 6384

z = 0.075

 

From the normal tables using right tailed test,

P = 0.47

 

B. At worst 11% means P = 0.11, so the z value at this is z = -1.23

-1.23 = (x – 9120) / 6384

x = 1267.68

4 0
3 years ago
A rectangular classroom has an area of 300 square feet. The length of the classroom is 5 feet longer than the width, w. Create a
weqwewe [10]

Answer:

w^2 + 5w = 300

Step-by-step explanation:

A= length x width

A =300

Width = w

length = w + 5

Therefore

300 = (w) x (w + 5)

300 = w^2 + 5w

w^2 + 5w = 300

6 0
3 years ago
Money from an allowance or job is known as what
sineoko [7]

Answer:

salary my guesss don't know right or wrong

3 0
3 years ago
Read 2 more answers
Please I really need help
ohaa [14]

9514 1404 393

Answer:

  • scale factor: 3
  • rule: (x, y) ⇒ (3x +15, 3y -24)
  • center: (-7.5, 12)

Step-by-step explanation:

The scale factor can be found by comparing the length of CB to the length of RQ.

  B-C = (-2, 8) -(-4, 9) = (2, -1)

  Q-R = (9, 0) -(3, 3) = (6, -3)

The length of RQ is clearly 3 times the length of CB, so the scale factor (k) is ...

  ratio of corresponding differences = 6/2 = -3/-1 = 3 . . . . . scale factor

__

We know that for dilation about a point O, the distance from O is multiplied by the scale factor. For dilation of point B to point Q, this means ...

  k(B -O) = (Q -O)

Solving for Q, we get ...

  Q = kB -kO +O . . . . this is what our dilation rule will look like.

The quantity O-kO can be found by subtracting kB:

  Q -kB = O -kO = O(1 -k)

This is what we need for our dilation rule.

  Q -kB = (9, 0) -3(-2, 8) = (9+6, 0-24) = (15, -24)

So, our dilation rule is ...

  (x, y) ⇒ k(x, y) +(15, -24)

  (x, y) ⇒ (3x +15, 3y -24) . . . . . dilation rule

__

The center of dilation can be found from ...

  (Q -kB)/(1 -k) = O

  O = (15, -24)/(1 -3) = (-7.5, 12)

The center of dilation is (-7.5, 12).

_____

<em>Additional comments</em>

On the graph, the center of dilation can be found by drawing a line through a point and its image. (Points are always dilated along a line through the center of dilation.) The intersection of two such lines is the center of dilation.

On this graph, the center is just above the top edge of the chart, at point (-7.5, 12). You can see this if you carefully draw lines BQ and AP.

You usually have coordinates for two original points and two image points, so finding the scale factor the way we did is not difficult. If you just have one point on the original and the image, the scale factor is found by finding their distances from the center of dilation. Each image point is k times as far as each original point from that center.

7 0
3 years ago
2) ½ b – 39 = 101 please show your work
aliya0001 [1]
1/2 b-39=101
       +39  +39
1/2 b= 140
2(1/2) b= 140(2)
b=280
6 0
3 years ago
Read 2 more answers
Other questions:
  • A glass cylinder is completely filled with 24x^5y^8 cubic inches of salt solution. The jug has a base area of 4x^5 square inches
    10·1 answer
  • The ratio of boys to girls in the ninth grade is 6:5. If there are 185 girls in the class, how many boys are there.
    13·2 answers
  • Angles 2 and angle 7 are ??? angles​
    8·2 answers
  • Khan sold his cycle at loss of 8%.had He sold it for 240 more he would have gained 12%
    11·1 answer
  • 2/3 • 3/2 (3x+6)=4x+3•3/2
    13·1 answer
  • Find the volume V of the described solid S. The base of S is the region enclosed by the parabola y = 3 − 3x2 and the x-axis. Cro
    7·1 answer
  • What steps need to be taken so that quadrilateral ABCD can be transformed to overlap quadrilateral A’B’C’D’ so that their vertic
    12·2 answers
  • Write an equation for a line that goes through (3, -7) and is parallel to the line<br> y = 2x – 17
    6·1 answer
  • Write words in numbers in words 123,115,027​
    10·1 answer
  • PLZ HELP ME! THIS IS A GRADE! NO LINKS!
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!