Let . Then . Note that .
Recall that for , we have
This means that for , or , we have
Integrate the series to get
The believe the answer would be D.
So
sum means add
[3 times (x+4)]+[7 times (x+13)]
distribute
a(b+c)=ab+ac
3(x+4)=3x+12
7(x+13)=7x+13
now we have
3x+12+7x+13
add lk etmers
10x+25
Answer:
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Step-by-step explanation: