How many ways can the letters in the word poster be arranged

Twenty-five percent of the customers entering a grocery store between 5 p. m. and 7 p. m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Find the zeros of the function. write the smaller solution first, and the larger solution second f(x)= (x+6)^2-49

Which of the following is missing in the explicit formula for the compound interest geometric sequence below?