Mary and John are planning on having some new carpet and furniture for their lounge and need to carry out some calculations. The diagram shows the aerial view of a lounge which is to be decorated, carpeted, and furnished (not drawn to scale).

Carpet costs £4.50 per square meter
Fitting the carpet costs £40 call out and £1.50 per hour fitting
The fitters can lay 5m2 of carpet per hour

Find the cost of fitting the carpet.

coins of silver or gold

step-by-step explanation:

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,

5

10

15

20

25

30

35

40

45

50

55

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: