Answer:
The sum of the first twenty-seven terms is 1,188
Step-by-step explanation:
we know that
The formula of the sum in arithmetic sequence is equal to
where
n is the number of terms
a1 is the first term
d is the common difference (constant)
step 1
Find the common difference d
we have
n=7
a1=-8
S=28
substitute and solve for d
step 2
Find the sum of the first twenty-seven terms
we have
n=27
a1=-8
d=4
substitute
250
B.
125
C.
80
D.
40
Answer: C. 80
Step-by-step explanation: I just took the test
Answer: x=21
Step-by-step explanation:
add 3 to both sides -7/3x-3+3 = -52+3
simplify -7/3x = -49
multiply both sides by 3 3(-7/3x) =3 (-49)
simplify -7x= -147
divide both sides by -7 -7x/-7 = -147/-7
then simplify x=21
2, 4, 16, 256 . . .
What is the next number in the sequence?