3+ { 1 – 3[20 + 2(-6 – 7)]}

enter the answer in the box.
answer correctly, needs to be done quick.

What percent of 18 is 24? and plz explain thx.

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.

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.