If a piece of rope cost 20 cents per 2 feet, how many feet can you buy for 30 dollars?

Is the point (0, 8) on the x-axis or y-axis? how do you know?

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

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.