Write the number that makes each equation true

Ok ... I'm confused, this is about covering metric units of length. Mount Saint Helens, a volcano, erupted on May 18, 1980. Before eruption, Mount St. Helens was 2,950 meters high. After eruption, it was 2,550 meters high.

Tell how you know that a system of two linear equations has more than one solution. how many solutions will such a system have? justify your answer

Find the coefficient of x4 in the expansion (2x + 3) 5.

My shoes were only $49.50, but I also had to pay 4% tax. What was my total?

Solve the system. y = 2 - 6x 12y - x = 1

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.