Solve 3x^2-27=0 using square roots

Peter is going to put up 5 walls in the tree house. each wall will be 7 feet high and 7 feet across. he wants to leave room for windows that measure 2 feet by 2 feet.

What is the circumference of circle P? Express your answer in terms of pi. PC = 17 cm.

Katie earned $480 in 8 years on an investment at a 6% annual simple interest rate. How much was Katie's investment?

Find the lowest common denominator for these fractions and then add and simplify. 2/3 and 1/6

Estimate a 5% tip on a bill of $79.54 by first rounding the bill amount to the nearest ten dollars.

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.