Simplify 3 squared times 21 squared

How do you solve 3+7*2-18/3=

What is the sum of the six term of the geometric series? 2-6+18-54

George buys a computer. he pays a deposit of £200 and six monthly instalments of £55. how much does george pay for his computer in total?

What is the product? (-3s + 2t) (4s - t)

Sanjay has 10 blue envelopes. He has 6 fewer yellow envelopes than blue envelopes. He has 5 times as many green envelopes as yellow envelopes. How many envelopes does Sanjay have in all?

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.