Sum of an infinite geometric sequence with the common ratio r, and the first term a1 is

we notice
-2 times -1/4=1/2,
1/2 times -1/4=-1/8
so a1=-2
r=-1/4 or -0.25
so the sum is

=

=

=

=
the sum is -8/5 or -1.6
Answer: 23
4x4=16 ( it represents the four weeks and the four inch growth each week)
Now just do 16+7 which equals to 23
Answer:
-7
Step-by-step explanation:
You divide -3 on both sides to get the variable by itself, so -3 divided by 21 is -7
Answer:
D. 15/12 and 5/4
Step-by-step explanation:
15/5=3
12/4=3
I believe it is -1 since -3 times -1 equals 3 and the rate of change is based on the slope of a line