Based on the form of the equation, what is the best way to graph the line 3x+3y=15? Select the correct answer below:

A. Recognize the equation as that of a vertical line passing through the x-axis at 15.

B. Recognize the equation as that of a vertical line passing through the x-axis at 15.

C. Identify the slope and y-intercept, and then graph.

D. Find the x- and y-intercepts, and then graph.

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.