Express cos9x cos3x as a sum of two trigonometry function ​

Factor p 2 + 18p + 32. (p+ 4)(p + 8) (p + 2)p+ 16) (p + 16)2

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function