Will give brainiest! for right answer! evaluate the expression 3.14(a2 + ab) when a = 4 and b = 2. (input decimals only, such as 12.71, as the answer.)

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Solve for x. −3/4(x+2)=6 enter your answer in the box

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.