Bill, phil and jenny are siblings. bill is twice as old as phil. jenny is two years younger than bill. currently their dad is twice as old as the sum of their ages. in nine years, dad's new age will be equal to the sum o his three kids new ages. what is jenny's current age.
i really need so if someone could plz me that would be great.

Which expression is equivalent to 5r6141 2r+st6

How do you find the area of a triangle

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.