Mr. Coleman has 30 students in his science class. He noticed that 27 of those students use backpacks to carry their books. What percent of the students in Mr. Coleman's class use backpacks to carry their books?

90% of the students in Mr. Coleman's class uses backpacks to carry their books.

Step-by-step explanation:

27 ÷ 30 = .9 = 90

round the decimal two places to the right

hope this helps!!

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