What is the sign of - a^4/3 when a < 0?
this question is called "signs of expressions challenge".

Find the value of x for which abcd must be a parallelogram -9-6x x-30

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 (%)

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a