Dom has enough tins of paint to cover a total surface of 280m squared. he needs to paint a community hall with an area to be painted of 255m squared. calculate the percentage of paint that should be left over. give your answer to 1 decimal place.

8.9%

Step-by-step explanation:

Total surface area of paint available=Surface area to paint community hall+Remainder

where;

Total surface area of paint available =280 m²

Surface area to paint community hall=255 m²

Remainder=x

Replacing;

280=255+x

x=280-255

x=25 m²

Percentage of paint to be left over=(Remainder/Total)×100

(25/280)×100=8.929

8.929 to 1 decimal place=8.9%

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: