10 children attended a party, if all the children shake hands with each other, how many handshakes were at the party?

The vertices of a parallelogram are j (-5,0) K (1,4), L (3,1) and M (-3,-3). How can you use slope to determine whether the parallelogram is a rectangle? is it a rectangle? Justify your answer.

Charlie is a car salesman. He earns $800 plus 9% comission on all of his sales for the week. If Charlie received a paycheck for $1916 this week, how much were his total sales? A. 5,300 B. 890 C. 12,400 D. 13,750

A savings account pays 4 1/2% interest. How much interest will be earned on $450 in 3 years? How much money will be in the account in 3 years?

Each swing that Susan builds requires $10 in hardware and $20 in wood. She uses the expression 10 + 20 to represent the total cost of building one swing. Which expression represents the total cost of building three swings? A. 10 + (3 • 20) B.

9 yards=? miles how many miles does 9 yards equal?

What is the solution to the equation 7 (a - 10) = 13 - 2 (2a + 3) ? a = StartFraction 26 Over 11 EndFraction a = 7 a = StartFraction 89 Over 11 EndFraction a = 621

Craig randomly surveys 50 people to find their favorite store at the mall. He finds that 18 people say they like the clothing store the best.

Factor x 2 + xy - 2x - 2y. (x + 2) (x - y) (x + y) (x - 2) (x - y) (x + 2)

Estimate the product of 28.21 times 8.02

How many laps around the track equals a mile?