Evaluate the expression x - 9, if x = 12. 1. 21
2. 17
3. 4
or 4. 3

what’s the answer what number?

How many units away is 1 from -6 on a number line?

How many days was the temperature above 90 degrees?

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?