Answer:
23.5 - 18.7 = x
Step-by-step explanation:
Isolate the variable
The product is a bit less than the estimate. In fact, 7.69 is less than 8, and if you start with an equality, i.e.

you can multiply both sides by a positive number, and the inequality will still hold:

The center is (-1,-2)
the radius is 4
Answer:
11. 
Take out 2x ( greatest common factor )

Factor


Don't forget about the 2x we took out earlier
Solution to 11: 
12. 
This is the difference of squares, so let's use the formula...

if,
and 
then, the Solution to 12 is:

13. 
First of all, you must find the greatest common factor because there isn't anything else you can do.

Now you can see the difference of cubes...

so, the Solution to 13 is:
