Explain how to find 398 + 257 with mental math and with the standard algorithm. Which do you think is easier ? Why ?

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

Arectangle with an area of 47 m² is dilated by a factor of 7. what is the area of the dilated rectangle? enter your answer in the box. do not leave your answer as a fraction.

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 (%)