Cos theta + cot theta equal to K then prove that sin theta equal to 2 k by K square + 1​

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

Which of the following is the shape of a cross section of the figure shown below

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?