Question

Please help!! See the attachment, please!​

Answer 1

`946`

Explanation:

we know that

The formula to find the sum is equal to

`S=(a1+an)n/2`

where

a1 is the first term

an is the last term

n is the number of terms

In this problem we have

`n=11`

`a1=(98-2(1))=96`

`an=(98-2(11))=76`

substitute the values in the formula

`S=(96+76)(11/2)=946`