What is the LCD of 11/12 and 7/8

Use the x-intercept method to find all real solutions of the equation.x^3-10x^2+27x-18=0

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Choose the more precise measurement. 26.4 cm or 8.39 cm