What is the percent of change for 156 minutes to 70 minutes

Which shows the pre image of triangle xyz

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

Use sigma notation to represent the following series for 9 terms.