Write 3954 in expanded form using powers of 10

What is the percent of increase for a population that changed from 438,000 to 561,000

20 points! asap! a is known to be 6,500 feet above sea level; ab = 600 feet. the angle at a looking up at p is 20°. the angle at b looking up at p is 35°. how far above sea level is the peak p? find the height of the mountain peak to the nearest foot. height above sea level =

Explain how you can use the associative property to evaluate (7x50)x4.