The problem ask to find the value of the cos(infinity) and the best answer, base on my further calculation and formulation that came up to a solution that leads me to an answer that the cos(infinity) is undefined but it has a range of (-1,1). I hope you are satisfied with my answer and feel free to ask for more 
        
                    
             
        
        
        
Answer:
there has to be a graph or table right?
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
she started with 75 and puts in 15 dollars every week. meaning that she initially deposited $75
 
        
                    
             
        
        
        
Answer:
2 students study none of the subjects. 
Step-by-step explanation:
Consider the attached venn diagram. First, we place that 1 student studies the three subjects. Then, we notice that 3 students study math and science, then 2 students study math and science only, since we have 1 that studies the three subjects. In the same fashion, we have that 3 students study Math and computer programming only (since they are 4 in total). Note that since 7 students study math, and we already have 6 students in our count in the math subject this implies that 1 student studies only math (the total number of students inside the math circle must add to 7).
We also have that 4 students study science and computer programming only. Which implies that we must have 3 students that study science only (10 students that study science in total) and 2 students study computer programming (for a total of 10 students). The total number of students that study none is the total number of students (18) minus the amount of students that is inside the circles (16) which is 2.
 
        
                    
             
        
        
        
Answer:
122.5
Step-by-step explanation:
take 8.75 multiply it by 2 then multiply it by 7 to get your answer 122.5