A radioisotope has a half-life of 4 days. How much of a 20-gram sample of this radioisotope remains at the end of 16 day time period?group of answer choices 2. 5 gram 1. 25 gram 10 gram 5 gram.

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate. in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30

Solving algebraic equations 2m+3=11

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?