A) in a group of 100 people, each one knows at least 67 other people. prove that there exist 4 people who are mutual friends.

Write a function that matches the description. a cosine function has a maximum of 5 and a minimum value of -5. f (r) =

Mr. and mrs. wallace have decided to buy a car for $21,600. they finance $15,000 of it with a 5-year auto loan at 2.9% arp. what will be their monthly payment be? a. $268.20 b. $268.86 c. $269.54 d. $387.16 i need !

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?