Find an explicit formula for the following sequence, an, which starts with a1=8.
1 answer:
Answer:
= 14 - 6n
Step-by-step explanation:
Note there is a common difference d between consecutive terms
2 - 8 = - 4 - 2 = - 10 - (- 4) = - 16 - (- 10) = - 6
This indicates the sequence is arithmetic with n th term
= a₁ + (n - 1)d
where a₁ is the first term and d the common difference
Here a₁ = 8 and d = - 6, thus
= 8 - 6(n - 1) = 8 - 6n + 6 = 14 - 6n
You might be interested in
So, we have the percentage she gets which is, 90% and the number of questions she answers correctly, which is 27
To find the number of questions in the exam, make an equation
(90% =
= 0.9)
= 
cross multiply and equate them
90x = 27 x 100
90x = 2700
divide by 90 on either sides to isolate x in order to find the answer
90 and 90 cancels out
x = 30
So your final answer will be, there were 30 questions in the exam paper.
To find the number of questions in the exam, make an equation
(90% =
cross multiply and equate them
90x = 27 x 100
90x = 2700
divide by 90 on either sides to isolate x in order to find the answer
90 and 90 cancels out
x = 30
So your final answer will be, there were 30 questions in the exam paper.