Why is solution not a pure substance?

Write a real world problem for the equation x-75=200

In the following equations solve for x 2 (x - 1) = 16 (3*1) - (5=86) - 10

What is the area of the stovetop, that does not include the burners? The square measures 24 in. by 22 in. and the burners, there are four, 1 in each corner. 1 circle equals 6 in.

2.9 rounded to nearest hundredth

Otis had a salad for $4.50, a sandwich for $6.25, and a drink. The tax for the meal was $0.54. What is the price for the drink. Meal tax:4.4%

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.