Ionly need with this one.
can you also explain it for me and how i can solve future problems like this?

Which matrix multiplication is possible?

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 (%)

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1