Ella bought some key chains and spent a total of $24.each key chain cost the same whole-dollar amount. she bought between 7 and 11 key chains. how many key chains did ella buy?show your work

You are constructing a histogram for scores that range from 70 to 100 in whole points. frequencies range from 3 to 10; that is, every whole-point score between 60 and 100 occurs at least 3 times, and at least one score occurs 10 times. which of these would probably be the best range and size for the score intervals along the x-axis?

The amount of money, in dollars, in an account after t years is given by a = 1000(1.03)^t. the initial deposit into the account was $_^a0 and the interest rate was _a1% per year. only enter numbers in the boxes. do not include any commas or decimal points^t. the initial deposit into the account was $__^a0 and the interest rate is % per year.

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