What are the period and amplitude of the function? Identify the period and amplitude of a periodic function.

period: 4; amplitude: 3

period: 4; amplitude: 2.5

period: 5; amplitude: 3

period: 5; amplitude: 2.5

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Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.