String a is 35 centimeters long. string b is 5 times as long as string a. booth are necssary to create a decorative bottle. find the total length of string needed for 17 identicaldecorative bottles.

You need multiply 35cm by 5 in order to get the length of string b which will be 175cm and than you need to add 175cm to 35cm to create one decorative bottle which gives you 210cm. After that you need to multiply 210cm by 17 which gives you 3570cm