What is the approximate dew point temperature when the dry-bulb temperature is 18°C and the wet-bulb temperature is 14.5°C?

before we can answer, we have to see the choices that are printed there with the question.   that's the only way we can point you to the correct one.

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

6 cos 34, 6 sin 34 trig

the answer is b, have negligible mass