Answer:
B. 47
Step-by-step explanation:
The formula for an arithmetic sequence is
an = a1+d(n-1)
a1 =3 (it is the first term)
We can find the common difference by taking the second term and subtracting the first term
5-3 =2
d=2
n = the term number we are looking for
an = 3 + 2(n-1)
We are looking for the 23rd term so n=23
a23 = 3 +2(23-1)
= 3 +2(22)
= 3+44
= 47
18 would have to be the mean because of the average
Recall the double/half angle formulas:


We're given
, and since
is between π/2 and π, we expect
to be negative. So from the Pythagorean identity, we find

Also, we know
will fall between π/4 and π/2, so both
and
will be positive. Then we find


and it follows that

Answer:
-12
Step-by-step explanation:
Answer:
What problem?
Step-by-step explanation:
I dont see anything