7 people shake hands. Give a formula to represent the number of handshakes if n is the number of people

Maya purchased a prepaid phone card for $20. Long distance calls cost 13 cents a minute using this card. Maya used her card only once to make a long distance call. If the remaining credit on her card is $17.92, how many minutes did her call last?

Gia needs to make an investment that will double in 8 years. Which interest rate, compounded annually, is the lowest rate that will allow for this to happen? A. 4.4% B. 7.2% C. 9% D. 14.4%

A rectangle has a perimeter of 54 miles and a height of 18 miles. What is the length of the base?

A suit cost $95 Barry has a discount coupon for 10% off and the city has a 4.5 percent sales tax what is the final cost of the suit

What is 7.76 rounded to 1 decimal place

Are the two equations - 6 + y = 2x and 2y - 4x = 12 dependent?

Which number is one-third of the way between 2.2 and 8.5? 5.35 3.15 4.3 3.775 I have no idea how to do this.

On call = 3.5 hours:$10 Talk Time = 1/2 hour: $1.25 Wich company offers the best deal? explain your answer

What is 5 - (-27 - (-189+243x)) distributed

Twenty-four soccer players, four coaches, and one equipment manager are traveling to a game in minivans. The capacity each minivan is 6 people. How many people are riding in the last minivan if the other minivans are filled to capacity?