Answer:
Below in bold.
Step-by-step explanation:
First term a1 = 13
11th term a11 = a1 + 10d = 83
So a1 + 10d - a1 = 83 - 13
10d = 70
d = 10
The common difference d = 7.
Sum of n terms = (n/2)[2a1 + (n - 1)d]
Sum of the first 20 terms:
S20 = (20/2)[2*13 + (20-1)7]
S20 = 10 *(26 + 19*7)
S20 = 10*159 = 1590.
Her total amount of pencils is b+y
Answer:because they are both interscting DUUUUUUUUHHHHHHH
Step-by-step explanation:
N + q = 20.05n + .25q = 3.40
substitute n = 20 - q .05(20-q) + .25q = 3.40
q = 12
20-12=8
n = 8