Một hộp có 4 bi xanh, 4 bi đỏ, 5 bi vàng. có bao nhiêu cách chọn ra 4 bi có đủ 3 màu? có đúng 2 màu?

Do graduates from uf tend to have a higher income than students at fsu, five years after graduation? a random sample of 100 graduates was taken from both schools. let muf be the population mean salary at uf and let mufsu be the population mean salary at fsu. how should we write the alternative hypothesis?

Which expression is equivalent to 4 square root 6 divided by 3 root 2

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9