Mrs. ciampa had 27 students in her class last year she had 30 students in her math class. what is the percent of change?

Each of 6 samples has a different standard deviation. How many of the 6 samples could be from the same population?

Two similar cones have surface areas in the ration 4:9. find the ration of their lengths and their volumes

It cost $88.50 for 6 adults to see an exhibit on Egyptian mummies. About how much does it cost one adult to see the exhibit?

7 times a number is equal to 12 more than three times the number. Find the number.

A question on notation: Does sine inverse have an exponent? If not, why is there a negative one there? If so, why can't you just divide?

Imagine you live only one mile from work and you decide to walk. If you walk four miles per hour how long will it take you to walk one mile

Travis and his three friends went to dinner to celebrate graduation. The guys decided to divide the bill evenly. Each person paid $15. Which equation can be used to find the total amount of the bill? x/3=15 15x=3 x/4=15 15x=4

A parabola has the equation y=x^2-x-6. A line has a slope 2 and y-intercept - 2. Think of the system of equations that you can create with this information. What is a good strategy to use in order to solve the system or equations?

Evaluate a2+ab-b2+5 when a=2 and b=3

Which of these is a two-step equation? A. X+9 = 21 B. x = 11 + 2 C. 2x+9 = 21 D. x/3=9