If

is the common difference between terms in the sequence

, then



...

You're told that

(the sum of the first 16 terms in the sequence, presumably). Well, we know that


Recall that

so that we have

So we get
Answer:
QR
Step-by-step explanation:
Because if BC is congruent with OP then DE will congruent with QR
Answer:
Variant b
Step-by-step explanation:
If you multiply it should be a+b but if you divided
A+b-c
First you need to get x on one side so subtract 3x from both sides which will leave you with 8=2x-20. Next add 20 to both sides to get 28=2x. Then divide everything by 2 and you should get x = 14.