Working alone, john can complete a task in 150 minutes. kasey can complete the same task in only 120 minutes. john and kasey work together for 30 minutes and then alicia joins in. together they finish the task 20 minutes later. how long would it take alicia to complete the task by herself?

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

Human body temperatures have a mean of 98.20° f and a standard deviation of 0.62°. sally's temperature can be described by z = 1.4. what is her temperature? round your answer to the nearest hundredth. 99.07°f 97.33°f 99.60°f 100.45°f

Solve each quadratic equation by factoring and using the zero product property. [tex]x^2+6x+8=0[/tex]