Find the least common multiple of 1-x^2, and (x-1)^3
16-8y, and (y-2)^2
(x-3)^2, x^2-9, and (x+3)^3
(2a-1)^2, 1-4a^2, and 8a^3-12a^2+6a-1
Please help! Will give brainliest!

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations