(I need helppp pppllleeeaeee)
A 2.8 g sample of pure metal requires 10.1 J of energy to change its
temperature from 21°C to 36°C. What is this metal?

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.