Expand & Simplify (3x-3)^2 + (x+4)(x-1)

Please help... I have no clue what I'm doing and it's due in tomorrow. Thanks :)

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

Find the average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .

Find the perimeter of the figure shown above. a. 40 cm c. 52 cm b. 60 cm d. 75 cm select the best answer from the choices provided