Find the sum of the arithmetic series
3+8+13+..+438
1 answer:
Answer:
19404
Step-by-step explanation:
sum of arithmetic series is
Sn = n/2 (2a + (n-1)d)
or
Sn = n/2 (a + an)
a = 1st unit
an = last unit
d = difference
8-3 or 13-8 so d = 5
then first step is to find the value of n
an = a + (n-1)d
438 = 3 + (n-1)5
438 - 3 = 5n - 5
435 = 5n - 5
435 + 5 = 5n
440 = 5n
n = 440/5
n = 88
then we can find the sum
Sn = 88/2 (3 + 438)
S88 = 19404
You might be interested in
Answer:
(6, 5)
Step-by-step explanation:
add x's divide by 2 add y's divide by two
You can set up a proportion for this problem. So, 3/15=x/3. Cross multiply to get 15x=9, and then divide both sides of the equation by 15 to get x as 0.6. So Selena travels 0.6 of a mile in 3 minutes. Hope this helps!
Answer:
y = 3
x − 2
Step-by-step explanation:
I Use the slope formula and slope-intercept form y = m
x + b to find the equation.
Hope this helps:)
Answer:
16 / C
Step-by-step explanation:
-4 x -4 = 16
4 x 4 = 16
two negatives cancel out when multiplying, that is why it equals 16*