Evaluate 2x when x = 4

COULD SOMEONE HELPP

Both the red and blue line segments stretch from the center of the circle to a point on the circle. the length of the blue segment is 5. how long is the red line segment?

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible