Solve the linear equation by using the Gauss-Jordan elimination method

-2x-6y = 10

6x+18y = - 30

38 = y/2. What equals y?

There are 5,000 employees in a company. Each year 20% of the employees retire, but the company hires 500 new employees after the reduction. Write a recursive rule to find the number of employees for any year

In 1969, there were 25 companies located in the research triangle. By 1970, there were 47 companies in the park. What is the percent of increase in the number of companies during this year?

If the nth term of a sequence is 2n + 4, what is the sum of the first n terms?

Mike went to a football game with his family. They bought 5 boxes of popcorn and 3 programs, and spent $41. Sean's family went to the same game, bought 3 boxes of popcorn and 2 programs, and spent $26.

What is 2 3/5 + 1 3/5

Credit card A has an APR of 15.8% and an annual fee of $72, while credit card b has an Apr of 19.6% and no annual fee.

At another school they sell a different brand of gift wrap which costs $2 per package and cards for $5 per package. Your friends class sells 220 packages and earns a total of $695.

A publisher prints 1,912 copies of a book in each print run. If they print 305 runs, the manager wants to know about how many books will be printed. What is a reasonable estimate?

On Saturday, you catch insects for your science class. Five of the insects escape. The remaining insects are divided into three groups to share in class. Each group has nine insects. How many insects did you catch on Saturday?