Does anyone know what these are again I’m being timed so help quick

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

Jonathan puts $400 in a bank account. each year the account earns 6% simple interest. how much interest will be earned in 5 years?