Answer:
see explanation
Step-by-step explanation:
the sum to n terms of an arithmetic sequence is
=
[2a + (n - 1)d ]
where d is the common difference and a is the first term
here d = 9 - 7 = 7 - 5 = 2 and a = 5, hence
=
[(2 × 5) + 2(n - 1) ]
=
(10 + 2n - 2)
=
(2n + 8)
= n² + 4n
When sum = 165, then
n² + 4n = 165 ← rearrange into standard form
n² + 4n - 165 = 0 ← in standard form
(n + 15)(n - 11) = 0 ← in factored form
equate each factor to zero and solve for n
n + 15 = 0 ⇒ n = - 15
n - 11 = 0 ⇒ n = 11
but n > 0 ⇒ n = 11
The answer to this question is -345.82
In a fraction it would be -17291/50
Answer:
The answer is C so X is=16
Answer:
33.3333 m/s
hope this answer helps you.....
Answer:28
Step-by-step explanation:
Re-arrange either ascending or descending order
20,22,28,32,33
The middle one is 28
Let's Re-arrange in descending
33,32,28,22,20
Same thing as the first step 28