I think the answer is B if I am correct 18
Mistake in Line 2 : Was in the determining the values for a ,b,c
Mistake in Line 4 : Not taking the square roots of both sides.
Step-by-step explanation:

First Mistake : Line 2

Second Mistake : Line 4

Correct Solution :


Answer:
If you are trying to solve by substitution then you have 2 different possibilities of answer forms.
First Possibility: (Point form) (16,8)
Second Possibility: (equation form) x=16, y=8
<u><em>PLEASE MARK BRAINLIEST</em></u>
Answer:
First term (a) =8
Common difference (d)= t2-t1
=12-8
=4
Now, sum of first 31th term (tn31) =n/2{2a+(n-1)d}
= 31/2{2×8+(31-1)4}
=31/2{16+(30×4)
=31/2(16+120)
=31/2×126
=31×63
Step-by-step explanation:
Similarly use 19 as (n) for the 19th term
The number of adenine sim a strand of DNA is equal to the number of thymines.