1. given z_1=5(cos⁡〖20°〗+i sin⁡〖20°〗 ),z_2=4(cos⁡〖10°〗+i sin⁡〖10°〗) find: (leave answer in polar form.)
z_1^5

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?