Is 0.25 rational or irrational

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

Find the equation of the trend line (line of best fit). show your work i'm using the points (34,76) (42,91)

Use the frequency distribution, which shows the number of american voters (in millions) according to age, to find the probability that a voter chosen at random is in the 18 to 20 years old age range. ages frequency 18 to 20 5.9 21 to 24 7.7 25 to 34 20.4 35 to 44 25.1 45 to 64 54.4 65 and over 27.7 the probability that a voter chosen at random is in the 18 to 20 years old age range is nothing. (round to three decimal places as needed.)