What is the explicit rule for the sequence? -114, -109, -104, -99,

2-digit numbers less than 91 which are 1 less than a multiple of 10

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)