Please need help asap!! only answer if you know please A sample of Xenon has a weight of 500 mg and a half-life of approximately 5 years.

How much of the sample will remain after 5 years?
3 years?
1 year?
*Round all answers to the nearest 10th place.
Find a function f which models the amount of Xenon f(t), in mg, remaining after t years.
*Use ^ (shift 6) for exponents

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?

The width of a rectangle is half as long as the length. the rectangle has an area of 18 square feet. what are the length and width of the rectangle?