Answer:
1. -384
2. 91.125 or 91 1/8
Step-by-step explanation:
formula created by Carl gauss. he's super interesting. if you can read his bio
it's used to figure out stuff like population growth
formula is
an = a1r^n-1
* means multiply
^ means to the power of or exponent
a1 is the first number in the sequence
so 6 times what is -12? -2
-2 will be r
teacher wants a7
so
a7 = 6*-2^7-1
a7 = 6 * -2^6
a7 = 6 * -64
a7 = -384
the next one
to figure out a1
12 ÷ 8 = 1.5
a7 = 8 * 1.5^6
a7 = 91.125 or 91 1/8
