The diagram shows a CD which has a radius of 6 cm. a) work out the circumference of the CD. Give your answer correct to three significant figures. CDs of this size are cut from rectangular sheets of plastic . Each sheet is 1 meter long and 50 cm wide.  b) Work out The greatest number of CDs which can be cut from one rectangular sheet.

13 CDs can be cut from 1 m x 50 cm sheet

Step-by-step explanation:

a) The circunference of the CD is represented by the following formula:

(1)

Where:

- Horizontal position, measured in centimeters.

- Vertical position, measured in centimeters.

Now, we proceed to present a representation of the CD.

b) The area of a CD is represented by the following formula:

(2)

Where:

- Area of the CD, measured in square centimeters.

- Radius, measured in centimeters.

If we know that , then the area of a CD is:

The area of the sheet is represented by this expression:

(3)

Where:

- Area of the sheet, measured in square centimeters.

- Width of the sheet, measured in centimeters.

- Length of the sheet, measured in centimeters.

If we know that and , the area of the sheet is:

Now we divide the area of the sheet by the area of the CD:

(4)

The maximum number of CD is the integer that is closer to this result. Therefore, 13 CDs can be cut from 1 m x 50 cm sheet.

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

copy and paste, put it in google

is there a question here?

step-by-step explanation: