I don't get this!

What is the common difference of the following arithmetic sequence?

-1000, - 2000, - 3000, ...

Cookies are on sale for 1/3 off the regular price of 3 for $1.00. how much would a dozen cookies cost for sale price?

What is 3 square root - 27/64

A scale diagram of a building is 2 cm : 10 m. If the length in the diagram is 3.5 cm, what is the actual length of the building

Amber borrows $1,450 from the bank. If she repays the loan in 3 years, the annual interest rate is 5%, compounded annually. However, if she can repay the loan in 2 years, the annual rate is 3.5%, compounded annually.

A square yard measures 3600 square feet what is the length of one side of the yard?

Boat 1 leaves a dock headed due west at 8:00 AM traveling at a speed of 12 mph. At the same time a boat 2 leaves the dock headed due south traveling at a speed of 24 mph.

A Mathematics test was taken by 4 boys and 6 girls. The mean marks of the 10 students was 49. a) Calculate the total marks obtained by 10 students. b) If the mean marks of 6 girls was 51, calculate the mean marks of 4 boys.

Find an equation using absolute value that has the given solutions, a. two solutions, 22 and 22 b. two solutions, - 51 and 5 c. two solutions, - 9 and 39 d. one solution, 18

An object is launched from a platform. It's height is meters is modeled by: h (x) = - 5 (x+1) (x-9) where x represents the time in schools after the launch. How many seconds after launch will the object hit the ground

Each of the p children at a park receive 3 balloons. If the children receive at least 150 balloons in all, find the minimum number of children at the park.