The bar graph shows the numbers and colors of cars in a parking lot. the total number of silver and black cars equal the total number of red, white, and blue cars. how many black cars in the parking lot? a)9 , b) 10, c)15, d)30

In the geometric progression –3, 12, −48… what term is 3,072?

What is the ratio of the length of an object in yards to the length of the same object in miles?

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?