Each of the three shaded regions above is a semicircle. If AB=4, CD=2B, and BC=2AB, then the area of the entire shaded figure is:
A. 28 Pi
B. 42 Pi
C. 84 Pi
D. 96 Pi
E. 168 Pi

You show all your work.

Find the solution of system of equation y= x-4 y=4x+2

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3