In an electrical circuit, the voltage across a resistor is directly proportional to the current running through the resistor. If a current of 18 amps produces 720 volts across a resistor, how many volts would a current of 2.5 amps produce across an identical resistor? Record your answer and fill in the bubbles on your answer document.

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.