My sister with combining like terms & i just need some refreshing here is my question: n+4-9-5n=

-5-4n

Step-by-step explanation:

add 4 + -9 = -5

add n + -5n= -4n

Answer,

= -4n - 3

Explanation,

Combine Like Terms:

= n + 4 + −9 + −5n

= (n + −5n) + (4 + −9)

= −4n + −5

Hope This Helps :-)

15.5

step-by-step explanation:

5

∑

n = 1

substitute n = 1, 2, 3, 4, 5 and sum the terms

= + + + 2² + 2³

= 0.5 + 1 + 2 + 4 + 8

= 15.5