Two negative signs together change the sign to a positive sign.
Using the distributive property with the 7 you would have -(-7), the two negatives would make it +7
So you end up with -8 + 7
First we will find the 11th term
an = a1 + (n-1) * d
a11 = 12 + (11 - 1) * 5
a11 = 12 + 10 * 5
a11 = 12 + 50
a11 = 62
now we use the sum formula...
Sn = (n (a1 + an)) / 2
S11 = (11 (12 + 62)) / 2
S11 = (11 (74)) / 2
S11 = 814/2
S11 = 407
t-19/7
Multiply the entire expression by 7
7t -133
7t = 133
133/7 = 19
t = 19
Answer:
454
Step-by-step explanation:
Answer:
the vaulue is denominator
Step-by-step explanation:
it's it's the denominator
