Is the relation shown in the arrow diagram a function? Explain. An arrow diagram showing 2 paired with 24, 4 paired with 8, 6 paired with 16, 8 paired with 32, and 10 paired with 32.

Yes; Each input has only one output.

Yes; Each output has only one input.

No; Each input has only one output.

No; The output 32 has 2 inputs.

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.