Just #1 what’s the answer and how do I do it?

It is B

Step-by-step explanation:

(c² - 6c) + (7c + 5)

c² is it's own term

-6c + 7c combine to 'c'

5 is it's own term.

So it is c² + c +5

B. C^2 +c+5

Step-by-step explanation:

group them in families

(c^2-6c) +(7c+5)

       -6c+7c

C^2 +c +5

*Keep in mind that if 1 is in front of the variable than just put the letter/symbol

ci

step-by-step explanation:

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb