Which statement is true for both mechanical waves and electromagnetic waves? a. they carry energy over a distance
b. they transfer energy through empty space
c. they use matter to transmit the energy of a disturbance
d. they vibrate in the direction that is parallel to their direction of travel

How many $20 bills do you need to have to make $280

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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.