A lamina occupies the region inside the circle x2 + y2 = 6y but outside the circle x2 + y2 = 9. Find the center of mass if the density at any point is inversely proportional to its distance from the origin.

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

Match each inequality to the number line that represents its solution

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.