19. a county government says that a safe level of chlorine in a hot tub is within 1.75 ppm of 3.25 ppm.

a. write and solve an absolute value inequality to represent this situation.
b. a lifeguard measures the chlorine level in the pool and finds it is 1.0 ppm. should he add more chlorine? explain.

When benny’s sister penny is 24, benny’s age will be 125% of her age. how old is lenny? a) how old will benny be then? b)if benny is 12 years old now, how old is penny now? explain your reasoning.

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation