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.

Write an equation for the function that includes the points (2,100)and (3,100)

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?