After alexander's death, greece and macedonia were ruled by

Aschool principal ordered 1,000 pencils. he gave an equal number to each of 7 teachers untill had given out as many as possibe. how many pencils were left?

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

Pythagorean theorem what is the value of x? x = 2 sides are 8 and 10