The formula for finding the area of a sector of a circle is a=π r 2 ( x 360 ) a=πr2(x360) , where r is the radius of the circle and x is the measure of the central angle of the sector. solve for x.  x=aπr2360x=a360πr2x=360πr2ax=360aπr

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.