tại một ngân hàng 7 quầy ohujc vụ, 9 người khách ngẫu nhiên đi vào. Xác suất để quầy nào cũng có khách đi vào

The equation is y=17(7)+600 and it equals 717

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.