so, 7 is neutral anything past 7 is considered basic.
answer: <em>a water and ammonia solution with a pH of 11 (very basic).</em>
<em />any number under 7 is acidic and of course there are different degrees of acidic just like there are different degrees of basicity.
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- stomach's digestive juices, would be considered very acidic
-apple juice is also acidic but not as acidic like stomach juices.
- grape juice, is becoming less acidic.
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Hopefully this helped and good luck.
![4\sqrt{2} - 7 \sqrt{2} = - 3 \sqrt{2}](https://tex.z-dn.net/?f=%204%5Csqrt%7B2%7D%20%20-%207%20%5Csqrt%7B2%7D%20%20%3D%20%20-%203%20%5Csqrt%7B2%7D%20)
First question answer is B.
![3 \sqrt{7} - \sqrt{63} = \sqrt{63} - \sqrt{63} = 0](https://tex.z-dn.net/?f=3%20%5Csqrt%7B7%7D%20%20-%20%20%5Csqrt%7B63%7D%20%20%3D%20%20%5Csqrt%7B63%7D%20%20-%20%20%5Csqrt%7B63%7D%20%20%3D%200)
Second question answer is D.
3^2 = 9, 7 x 9 =63
**In case you're wondering why 3 square root 7 equals to square root 63.
Hope this helps.
Three hundred and forty-one of one thousand