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Option (D)

Step-by-step explanation:

Kevin delivers newspaper in his town and earns an amount represented by a linear equation,

y = 30x + 18

Here, y = total earnings

x = number of houses he delivers the newspaper

If he doesn't deliver any newspaper on a certain day, (x = 0)

Then total earnings, y = 30(0) + 18

y = 18 cents

Therefore, a certain amount of 18 cents will be paid even if he doesn't deliver any newspaper on a certain day.

Option (D) is the correct option.

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