Sean is conducting an experiment with an isotope of a particular element that has a half-life of 4 hours. he begins with a sample of the isotope with a mass of 92 grams. he then measures the mass of the object every hour. what is the approximate mass of the sample after 20 hours?

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i