An electrical goods department store charges $50 plus n cents per km for delivery of its products, where n = the number of cents over $1.20 of the price per litre of petrol. What will be the percentage increase
in the total delivery charge for a distance of 25 km when the petrol price changes from $1.45 to $1.52
per litre?

Could I also be shown full working out :)

What is the inverse of the function f(x) = 2x + 1?

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a. about 4 b. about 8 c. about 40 d. about 21

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.