8rooks are randomly placed on different squares of a chessboard. a rook is said to attack all of the squares in its row and its column. compute the probability that every square is occupied or attacked by at least 1 rook. you may leave unevaluated binomial coefficients in your answer.

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)