Summation

[hayleyalissasmith]

Hello can someone explain this to me please it’s urgent

 

[Dr.Peterson]

Hello can someone explain this to me please it’s urgent

I'm guessing you're asking about this:

We need two things from you: the entire problem, including instructions; and something from you to show how you are thinking, or at least what you have learned that you could use (e.g. formulas for particular sums).

But I would probably start by expanding the term. I suspect you would then see that you have a formula for each part of it.

I also see that you broke a rule by submitting this twice, rather than waiting patiently for moderation.

 

[JeffM]

Explain what? That is an expression. What is there to explain