Mr. Gomez’s students need to earn a total of 100 points for a class reward. The class earned 42 points in March and 24 points in April.
Which is the best estimate for the number of points the class needs in May to be sure they will earn the reward?

a. 30 points
b. 40 points
c. 60 points
d. 70 points

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  

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.