Use this formula:

a) d=11
Work:
d=sqrt((4-(-7))^2+(5-5)^2
d=sqrt((11)^2+(0)^2)
d=sqrt(121+0)
d=sqrt(121)
d=11
b) d=4
c) d = 16
d) d=160
e) d=12
Answer:
For one adult it costs $15
For one child it costs $10
Step-by-step explanation:
So..
One adult = $15
Two children = $20 10×10
= $35
Then..
Two adult = $30 15×15
Three children = $30 10×10×10
= $60
Plz mark brainliest thanks
its a 100% increase since the amount completely doubled
hope this helps!!
By using the general formula for a geometric sequence, we will find that the correct option is c: 86
<h3>
Working with geometric sequences:</h3>
The general formula for the nth term in a geometric sequence is:

Where r is the common ratio of the geometric sequence here we know that:
- a₁ = 2
- a₇ = 128
- r is negative.
Replacing the first two in the general formula we get:

Where we took the negative solution for the root. Now that we know the common ratio we can find the other terms:

The sum gives:
2 - 4 + 8 - 16 + 32 - 64 + 128 = 86
So the correct option is c.
If you want to learn more about geometric sequences, you can read:
brainly.com/question/9300199
Answer:
is always an odd number
Step-by-step explanation:
100-45=55
50-23=27
2-1=1