Answer:
Step-by-step explanation:
Circumference = 2πr
Let's set the equation equal to the formula:
16 = 2πr
16/2 = πr
8 = πr
r = 8/π
X=6
y=7
6+7
= 13
1/2(6) + 7
= 3 +7
=10
Answer:
900 million.
Step-by-step explanation:
It's estimated that there are 900 million dogs in the world, as of 2018.
How I understand from your writing next term is equal previous plus 3,
if 1st is -4, then next (second) should be -4+3= -1
Example: 
We can see that there is more than one number with the variable x, therefore, we say they're ''like terms'' and because of that they can be summed. We do this with all of the other numbers with similar variables. If no numbers with similar variables are left, like 4a, you don't do anything but write them as they are. You can also see that 8 and 9 can also be summed because neither of them has a variable, therefore they're similar.
In this step, you just do the operation with the numbers and keep the same variable.


since there are not more numbers similar in variables, this operation is done.
