Buffy is purchasing a decorative ribbon in sections that each measure
2.5 feet long. she needs a total of 200 feet of ribbon to make all of the
crafts that she has planned. if each section of ribbon costs $2.72, how
much will she have to spend to buy all of the ribbon she needs?
label required

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.