(Will give Brainliest! Timed test) Which expression is equivalent to (StartRoot 3 EndRoot + i) cubed?

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

15/16 as a decimal rounded to the nearest hundredth

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.