Answer:
−8a2−3b+76
Step-by-step explanation:
=13a2+−3b+−21a2+76
Combine Like Terms:
=13a2+−3b+−21a2+76
=(13a2+−21a2)+(−3b)+(76)
=−8a2+−3b+76
Each element is 2/3 times the previous one, so that's a geometric sequence.
6×(2/3)=4, 4×(2/3)=8/3, 8/3×(2/3)=16/9, 16/9×(2/3)=32/27
Answer: 6, 4, 8/3, 16/9, 32/27
In the given question,the given explicit formula is

Which is of the form

So the constant difference is 7 here.
Now for the recursive formula
To find the next term, we need to add 7 to the current term, that is

So the correct option is B
You know that he makes $90 for doing chores, dividing that by 6 and you get that each week he earns $15 for chores.