Askate shop owner ordered 60 skateboards from the manufacturer . out of the 60 boards that were ordered, 18 were longboard. he wants to know what percent of his order was longboards?

30%

Explanation:

if you put the numbers into a fraction 18/30 and then simplify you'd get 0.3, in school i learns to see decimals and percentages as "DP"  you would take the decimal place and move it twice to behind the letter "P" this action gives you 30%

incident infrared radiation is blocked. visible and ultraviolet radiation heat   earth.

earth radiates infrared radiation. infrared radiation is blocked and heats earth. visible and shortwave radiation heat earth.

earth radiates longwave radiation

longwave radiation is reflected downward longwave radiation heats earth