If the ratio of the radii of two spheres is 1 : 8, what is the ratio of the surface areas of the two spheres? 1 : 8 1 : 512 1 : 64 r2ππ : 8r2π

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

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 (%)