The cities of mecca and medina were vital to the foundation of what religion?

The principle of checks and balances is based on the notion that

Astudent answers 86 problems on a test correctly and receives a grade of 98% how many problems were worth the same number of points

Which of these would be describing a developed country? a) literacy rate of 84% b) life expectancy of 58 years c) post-secondary education rate of 10% d) infant mortality rate of 3 per 1,000 births