The formula for the sum of n terms in an arithmetic progression is:
S = n/2 * (2a + (n-1)d)
Here, the common difference, d, is 8 and the first term, a, is 1. Substituting these into the formula, we get:

S = n/2 * (2*1 + 8(n - 1))
S = n + 4n² - 4n
S = 4n² - 3n
The answer is A.

8 0

3 years ago

Pls help I really need the answer right now

Step2247 [10]

Use photo-math or Gauth-math application can help u this

5 0

2 years ago

What type of conic section is the following equation? x2 - 4y2 = 100 parabola circle hyperbola ellipse

chubhunter [2.5K]

Answer:

hyperbola

Step-by-step explanation:

3 0

3 years ago

PLEASE HELP MAX POINTS ONE OF THE LAST ASSIGNMENTS IN THE SEMESTER, I HAVE 4 HOURS TO FINISH MY HOMEWORK

kirill [66]

Answer:

Two angles are called complementary if their measures add to 90 degrees, and called supplementary if their measures add to 180 degrees. ... For example, a 50-degree angle and a 40-degree angle are complementary; a 60-degree angle and a 120-degree angle are supplementary

4 0

2 years ago