An element with mass 670 grams decays by 21.8% per minute. how much of the element is remaining after 15 minutes, to the nearest 10th of a gram?

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

The expression 1.01*1.005(^t) gives the amount of money, in thousands of dollars, in carter's savings account (t) years after he opens it. what does 1.01 represent in this expression?