Rút gọn (x-y)^2+4xy
(2x+y)^2-(y-2x)^2
(6x-2)^2+4(3x-1)(2+y)+(y+2)
PLEASE HELP ME

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score