In Africa, wealthier countries all have
higher life expectancies. True or false?
pls help thx I'm really stuck!

The statement is true.

Explanation:

In Africa, as in all other continents, life expectancy tends to be the highest in the countries that are wealthier and being lowest in the countries that are poorest. A good example of this is Egypt and South Africa as some of the wealthiest countries in Africa and having among the highest life expectancies, while on the other hand, Burundi and Somalia being among the poorest and having among the lowest life expectancies.

The reason for this is not just that people have more money and can afford to buy more things. The reasons actually are that the wealthier countries have better education, health-care, infrastructure, a much lesser percentage of people are working out in the fields, etc. All of these things combined contribute to better and healthier living for the population, so they live longer because of it.

the answer is "c" im pretty sure.

81 is a composite number.