This is everything I have last question please anybody help

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 (%)

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Which of the following represents the factorization of the trinomial below? x^2+7x-30