Answer:
f = 40
Step-by-step explanation:
f=3c+19
Let c = 7
f = 3*7 +19
Multiply first
f = 21+19
f = 40
4 dozen because if you add all dozens and subtract
Or 48 cookies
B because x is the independent variable; you could choose any number for x
Answer:

Step-by-step explanation:
<h3><u>Given expression:</u></h3>
![=6a^2-4b^2+4abc-9b^2-4a^2+8abc\\\\Combine \ like \ terms\\\\=6a^2-4a^2-4b^2-9b^2+8abc+4abc\\\\=2a^2-13b^2+12abc\\\\\rule[225]{225}{2}](https://tex.z-dn.net/?f=%3D6a%5E2-4b%5E2%2B4abc-9b%5E2-4a%5E2%2B8abc%5C%5C%5C%5CCombine%20%5C%20like%20%5C%20terms%5C%5C%5C%5C%3D6a%5E2-4a%5E2-4b%5E2-9b%5E2%2B8abc%2B4abc%5C%5C%5C%5C%3D2a%5E2-13b%5E2%2B12abc%5C%5C%5C%5C%5Crule%5B225%5D%7B225%7D%7B2%7D)
1/100 This is because every percent is out of 100.