Remove parentheses
2c - 4 + 5c + 11
Combine like terms
Answer: 7c + 7
Answer:
f(x)=1/4(5-x)²
Step-by-step explanation:
f(11)=1/4(5-11)²
1/4(-6)²
1/4(36)
=9
One way to solve the system of equations would be to solve for q (in terms of r) in the first equation to get:
9r + q = 13
q = 13 - 9r
Then, take the value for q you just found and insert it into the second equation:
3r + 2(13-9r) = -4
Then simplify and solve:
3r + 26 - 18r = -4
-15r = -30
r = 2
Now that you have the value for r, plug it into either of the original equations and solve for q:
9r + q = 13
9(2) + q =13
18 + q = 13
q = -5
r = 2; q = -5
Step-by-step explanation:
Finding a regular polygon with <em>x </em>amount of sides, you use the equation 
to find the amount of triangles. Replace <em>x </em>with 15 and you will get 13. Each triangle has angles that add to 
, so you would do 180 * 13 to find the total of all of the interior angles, = 2340. Then, divide 2340 by 15, and you will get 156!
