Which expression is NOT equivalent to the other three

A - 9-7n+16n

B 9{n-9}

C n-9+8n

D 9n-9

Which is best deal 1/3 or 30% off

During the summer months the water level in Marta's pool decreases by about 1/2 inch each day due to evaporation. Which equation shows the total change, in inches, to the water level in her pool after 30 summer days?

A porch has the shape of a quarter circle with a diameter of 5 ft. What is the approximate area of the porch, rounded to the nearest square foot? Use 3.14 to approximate pi. The answer I got is 4.9ft

B) Work out the probability that a player will select a red ball.

28521 to the nearest tenth

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.