Perform the indicated row operation: |2 -1 -4|7|
|-1 2 1|-1|
|3 4 5|5|
R3+3R2R3
|2 -1 -4|7|
|-1 2 1|-1|
|_ _ _|_|
DONE

What is the volume of this square pyramid?

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Juanita wade's new car has an msrp of $28,902.11 including title and processing fees. the premier package which includes surround sound and dvd player costs three times the amount of the in-style package which includes leather seats and select wheels. the total cost of her new car was $34,290.08 which included the 6.5% sales tax. find the cost of the premier package to the nearest cent.