Find the z value for x=40 for a normal distribution with μ=30 and σ=5

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585

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.