Please help! Will mark brainliest
1 answer:
Answer:
Step-by-step explanation:
t1 = a1
t2 = a1 + d
t3 = a1 + 2d
The sum is t1 + t2 + t3 = a1 + a1 + d + a1 + 2d = 3a1 + 3d
Second question
t1 = a1
t2 = a1 + d
t3 = a1 + 2d
t4 = a1 + 3d
...
tn = a1 + (n - 1)*d
Sum = (a1 + a1 + (n- 1)*d) * n / 2
Sum = (2a1 + nd - d) * n / 2
Sum = (2a1*n + n^2*d - nd) / 2
You might be interested in
Answer:
<AFB
Step-by-step explanation:
Let U = {1, 2, 3, 4, 5, 6), A = {1, 2, 3, 4), and B = {1, 2, 4). Find the set A n B.
PSYCHO15rus [73]
Step-by-step explanation:
(A n b) = this means that we need d value that is in a and b only
ans= (1,2,4)
Answer:
Step-by-step explanation:
you have to have a quadratic equation, not sure what your question is,
Faces: 7
Edges: 12
Vertices: 7
Answer:
B. $337.50
Step-by-step explanation:
1.5% of $22,500 is 337.5
