Answer: since the 7 has to be less than a number, the equation would be n-7
Seems to be
an=4(an-1)
means the nth term is 4 times the previus term
easy, times each term by 4
so 2nd is 4*1/2 or 2
3rd term is 2 times 4 or 8
4th term is 8*4=32
first 4 terms are 1/2, 2, 8, 32
How do we draw it exactly
Answer:
x = 2
Step-by-step explanation:

Step 1: Cross multiply
We want to eliminate all denominators, so we multiply the opposite numerators and denominators

Step 2: Solve for x
Now we want x by itself, and we have to solve for x.
- Move all terms with x on one side

- Now remove all coefficients with x

-Chetan K
I think it is random sampling because he picked one out of every 3 girls. Therefore, he picked at random.
Hope that helped!
Mandy Woodland