Show it four ways

15+18=33

D2-9k+3 for d=10 and k=9

If a commission rate is 30%, what is the commission from the sale of 18,760 worth of air-conditioners.

X^2-2y/y when x=20 and y=x/2

Write down 4 odd digit numbers that will add up to 19

What is the simplest form of 27/90

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.