Answer:
-0.2
Step-by-step explanation:
B. This is the answer because it is not equivalent to anything else, and the answer simplified is: -18.
ANSWER
![3 \sqrt{7}](https://tex.z-dn.net/?f=3%20%5Csqrt%7B7%7D%20)
EXPLANATION
The given radical is
![7 \sqrt{7} - 2 \sqrt{28}](https://tex.z-dn.net/?f=7%20%5Csqrt%7B7%7D%20%20-%202%20%5Csqrt%7B28%7D%20)
Remove the perfect square from the second radical.
![= 7 \sqrt{7} - 2 \sqrt{4 \times 7}](https://tex.z-dn.net/?f=%20%3D%207%20%5Csqrt%7B7%7D%20%20-%202%20%5Csqrt%7B4%20%5Ctimes%207%7D%20)
![= 7 \sqrt{7} - 2 \sqrt{4} \times \sqrt{7}](https://tex.z-dn.net/?f=%20%3D%207%20%5Csqrt%7B7%7D%20%20-%202%20%5Csqrt%7B4%7D%20%20%5Ctimes%20%20%5Csqrt%7B7%7D%20)
![= 7 \sqrt{7} - 2 \times 2 \times \sqrt{7}](https://tex.z-dn.net/?f=%20%3D%207%20%5Csqrt%7B7%7D%20%20-%202%20%20%5Ctimes%202%20%5Ctimes%20%20%5Csqrt%7B7%7D%20)
![= 7 \sqrt{7} - 4 \sqrt{7}](https://tex.z-dn.net/?f=%20%3D%207%20%5Csqrt%7B7%7D%20%20-%204%20%5Csqrt%7B7%7D%20)
Subtract the like radicals
![= 3 \sqrt{7}](https://tex.z-dn.net/?f=%20%3D%203%20%5Csqrt%7B7%7D%20)
Answer:
2
Step-by-step explanation:
so uh grab like 1 pen and another one...then place them together then count how many pens you have...1+1=2
so you now have 2 pens...