The perimeter of a rectangular field is 368 yards. If the width of the field is 87 yards, what is it’s length

In the diagram below what is the approximate length of the minor arc ab

What is always true about a positive integer raised to a negative odd power?

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.