There are 30 students in a class. the teacher will choose 2 students at random to represent the class at an assembly. how many groups of 2 students can be chosen?

Prove that 16^4-2^13-4^5 is divisible by 11.

For the right triangle shown, the lengths of two sides are given. find the third side. leave your answer in simplified, radical form.

Pleasseee important quick note: enter your answer and show all the steps that you use to solve this problem in the space provided. use the circle graph shown below to answer the question. a pie chart labeled favorite sports to watch is divided into three portions. football represents 42 percent, baseball represents 33 percent, and soccer represents 25 percent. if 210 people said football was their favorite sport to watch, how many people were surveyed?