2) There were 80 golfers in the first round of a tournament. Of the 80, 62.5% qualified for the next round. How many did not qualify?

The system of equations graphed below has how many solutions?

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.