Acomputer and printer cost a total of $1236. the cost of the computer is three times the cost of the printer. find the cost of each item

Find x & pleeeeaaaassseeee me !

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

Which equation can be simplified to find the inverse of y = 2x2^2