What is the property of 7 + (a+b) = 7+a) + b

The grocery store pays a 15% tax on alcohol sales last year. The total tax paid last year was $3750. What was the total sales for alcohol last year?

If 40 people shake hands with each person in the class, how many handshakes

Yesterday, Craig's Doughnut Shop sold 1 3/4 times as many chocolate doughnuts as cinnamon doughnuts. If they sold 3 2/5 trays of cinnamon doughnuts, how many trays of chocolate doughnuts did they sell?

a dragonfly can beat its wings 30 times per second. write an equation in slope-intercept form that shows the relationship between flying time in seconds and the number of times that dragonfly beats its wings

The time required to finish a test in normally distributed with a mean of 80 minutes and a standard deviation of 15 minutes what is the probability That a student chosen at random will finish the test in more than 110 minutes

Compute the amount of interest earned in the following simple interest problem A deposit of $1,295 at 7% for 180 days

How do you decide which of two numbers is greater when one number is positive and one number is negative

List numbers in order from least to greates 4,-6,0,8,-9,1,-3 what the answer

Solve 2x2 + 16x + 50 = 0.

Leo the rabbit is climbing up a flight of 10 steps. Leo can only hop up 1 or 2 steps each time he hops. he never hops down, only up. how many different ways can leo hop up the stairs?