There is a sales tax of $9 on an item that costs $120 before tax. The sales tax on a second item is $19.05. How much does the second item cost before tax? Anything helps! :)

The sales of lawn mowers t years after a particular model is introduced is given by the function y= 5500 in (9t+4) where y is the number of mowers sold how many mowers will be sold 2 years after a model is introduced