Detailed answers appreciated: (7a -4) (2a -5)

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 (%)

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Iam at home. /: i am playing video games. translate the following statement into symbolic form.