Explain why a spark from a firework will not hurt you as much as a cup of hot tea?

It will not unless it contains as much energy as the cup of tea. So a tiny spark may be at 1,000 Celsius  but a whole cup of tea at 90 Celsius  will deliver far more heat (energy) to the skin as the spark.

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.