Need dedicated mathematicians to me : ( answer and explain brainliest + 45 points! determine the quadratic regression for the data. (1, 5) , (3, 4) , (4, 1) , (5, 2) , (7, 4)

Acylinder and its dimensions are shown. which equation can be used to find v, the volume of the cylinder in cubic centimeters?

If 25% of y is 30, what is 60% of y?

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 (%)