A radioactive element decays so that after t years, the amount remaining, expressed in milligrams, of the original amount, is A(t) = 100(0.5)^t/3.8. Determine the rate of decay when 25% of the element is gone. Round to two decimal places.

Asap for seven months an ice creams vendor collects data showing the number of cones sold a day (c) and the degrees above 70 degrees f the vendor finds that there is a positive linear association between c and t that is the best modeled by this equation c=3.7t+98 which statement is true? the model predicts that the average number of cones sold in a day is 3.7 the model predicts that the average number of cones sold i a day is 98 a model predicts that for each additional degree that the high temperature is above 70 degres f the total of number of cones sold increases by 3.7 the model predicts for each additional degree that the high temperature is above 70 degrees f the total number of cones sold increasingly by 98

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

The value of cos 30° is the same as which of the following?