Write an equation for each of the following problems and then solve. a number increased by 9 is -21

7friends share 4 pizzas equally how much pizza did each friend get

What are the domain and range of the function? f(x) = -4 (sqrt)x

1. the following set of data represents the number of waiting times in minutes from a random sample of 30 customers waiting for service at a department store. 4 5 7 10 11 11 12 12 13 15 15 17 17 17 17 17 18 20 20 21 22 22 23 24 25 27 27 31 31 32 a. determine the number of classes and class interval.