Solve the following system by any method.

8x+9y=-5

-8x-9y=5

Mike put 400 baseballs into 10 trash bins. He put the same number of baseballs in each bin. He took 5 trash bins of baseballs to the baseball field. How many baseballs did Mike take?

Perform the following calculations without rewriting the numbers in decimal form (6 * 10^11) (2.5 * 10^-5)

A 91 square foot bathroom has a length of 13 feet. what is the width of the bathroom

10x - 29 - 7x=-53 what is x?

What are the values of x and y when (3-2i) - (x+yi) = (2-3) ?

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.